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B
Guinea pig
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C
Man
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D
Rabbit
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Solution
The correct option is A Monkey Rh factor it was first discovered in the blood of Rhesus monkeys (small monkeys from India often used for experimentation) and thus such factor is called as Rh factor. It is an antigen, a substance which stimulates the production of antibodies to fight foreign invaders, such as viruses, bacteria and transplanted organs. A given individual either has the antigen already in their blood (they are Rh positive), or they don't (they are Rh negative). A patient's Rh status affects how he or she handles blood transfusions or organ transplants.