[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．