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题目材料：
Vernon disease is usually fatal if treatment is started only after severe symptoms appear, but it is curable in people of all ages if treated before then. Although fewer elderly people than young adults contract Vernon disease, far more elderly people than younger adults die of it.
Which of the following, if true, most helps to explain the apparent discrepancy?
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A.The course of treatment for Vernon disease typically lasts about a year.
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B.The incidence of Vernon disease is significantly greater now than it has been in the past.
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C.The interval between contracting Vernon disease and the onset of severe symptoms tends to be longer in elderly people than in younger adults.
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D.The earliest symptoms of Vernon disease are skin blotches much like those that are normal signs of aging.
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E.Young adults who develop Vernon disease and are cured of it cannot contract it again.
D显示答案
