[单选,材料题] According to the author,which of the following most interested the researchers?
根据以下资料,回答下面的题目。
According to the passage,which of the following is NOT true?
A . The mice that started dieting in old age. B . 27 of those 46 0ld genes that continued to behave like young genes. C . Calorie restriction that works in people. D . Dieting that makes sure a drug is effective.