Extract:
Concussion
A concussion is a traumatic injury to the brain that can interfere with the way the brain processes information and functions. A concussion often results in severe headaches, diminished alertness, and even unconsciousness.
While more than one million people in the United States suffer concussions every year, many believe that, like people, no two concussions are identical. Recently two professional baseball players suffered concussions. The first player was injured early in the season and tried twice to return to regular play, but was not medically cleared to play until the following year. Even after eight months, this player reported a recurring condition of “fogginess” that seemed to linger. The second player had brief symptoms of sleepiness and involuntary movement, or “shakiness.” A few days later, and after several tests, the second player reported that the effects of the concussion had subsided, and he was cleared to play.
No matter the duration of a person’s recovery, refraining from trying to do too much, too soon is vital. A specialist at Boston University’s Center for the Study of Traumatic Encephalopathy believes that someone who suffers a second concussion while still recovering from the first risks an even longer recovery.
Full recovery from concussions is possible. Problems are seldom permanent, and for most people who have had a concussion, the long-term prognosis is typically excellent. The first baseball player recently returned to his team. And though he was told by his physician that he has no greater risk than anyone else of suffering another concussion, other physicians believe that suffering one sports-related concussion increases the likelihood of suffering another.
Which of the following is not listed as a detail in the passage?
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A
Football and lacrosse players suffer the most concussions.
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B
More than a million Americans a year suffer concussions.
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C
Concussions may result in diminished alertness.
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D
It may take longer to recover from a second concussion.
The detail not listed is that football and lacrosse players suffer the most concussions, as the passage mentions only baseball players and makes no sport-specific prevalence claims.
A) Football and lacrosse players suffer the most concussions
This information never appears. The passage discusses two baseball players' concussion experiences but makes no comparisons across sports or identifies which sports have highest concussion rates.
B) More than a million Americans a year suffer concussions
This is explicitly stated: "more than one million people in the United States suffer concussions every year," establishing national incidence.
C) Concussions may result in diminished alertness
This is explicitly stated: concussions "often results in severe headaches, diminished alertness, and even unconsciousness," listing alertness reduction among common symptoms.
D) It may take longer to recover from a second concussion
This is explicitly stated through the Boston University specialist's warning that "someone who suffers a second concussion while still recovering from the first risks an even longer recovery."
Conclusion
Three details appear verbatim or paraphrased in the text: national incidence statistics, symptom descriptions, and second-impact syndrome risks. The football/lacrosse claim represents external knowledge absent from the passage's content boundaries.