Question

Rh factor is present in

• A. all vertebrates
• B. all mammals
• C. all reptiles
• D. man and rhesus monkey only

Answer 1

Answer: (D)

Rh factor was discovered by K Landsteiner and A S Wiener (1940) from rabbits immunized with the blood of monkey Macaco, rhesus. It is found is man and rhesus monkey only.