Rh factor is present in (correct answer + 1, wrong answer - 0.25)
A
all vertebrates only
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B
mammals and rhesus monkey only
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C
rhesus monkey only
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D
human and rhesus monkey only
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Solution
The correct option is D human and rhesus monkey only Rh factor was discovered by K Landsteiner and A S Wiener (1940) from rabbits immunized with the blood of monkey (Macaca rhesus). It is found in humans and rhesus monkey only.