单选题 The transgenic farm animals mentioned in this passage are ______.

A、 pigs, cows and mosquitoes that have gone through the transgenic procedure
B、 pigs, cows, sheep and chickens that have accepted additional genes
C、 leaner pigs, poultry that produce pharmaceuticals and healthier sheep
D、 leaner pigs, chickens resisting diseases and goats that produce milk with medicine in it

【正确答案】 D

【答案解析】根据文中第二段最后一句，判断选D。