单选题 The answers to the problem, the scientists say, is to build up the immune system, which not only will give greater ______ to disease but will boost cellular regeneration and improve the skin.
A. persistence B. insistence C. resistance D. instance

【正确答案】 C

【答案解析】选择resistance to diseases的根据是前面在谈的immune system，所以答案C是正确答案。