单选题 Sir John Sulston got a Nobel Prize for Medicine because he has ______.

A、 found that human beings are similar to the worm
B、 got the fact we share 40 percent of our genetic structure with the simple worm
C、 found the computer which controls each of the cells in the human body
D、 proved that cell death is programmed

【正确答案】 D

【答案解析】[考点] 细节题
[解析] 由文中最后一句话Sir John was the first scientist to prove the existence of programmed cell death．可知D 是正确的。A、B 两项提供研究前提。