Apes share .................. blood groups with man.

It has been proved by the blood protein tests that man is most closely related to great apes (Chimpanzee and Gorilla) and next closest, in order, are the old world monkeys, the new world monkeys and tarsiers. In humans four blood groups A,  B, O and AB and occur. The blood groups A and are found in apes but not in monkeys. This indicates that human beings are more closely related to apes than to monkey. There is 99 per cent homology in haemoglobin of man and gorilla. This suggests that the two are closely related. Thus, option D is correct.