Question

What is correct for a person with blood group $O$ ?

• A. The person has no antigen for both A and B antibodies
• B. His blood has antibodies for both A and B antigens
• C. Both (a) and (b)
• D. None of the above

Answer 1

Answer: (C)

Landsteiner recognised three blood groups i.e., $A,B$ and $O$. Fourth blood group $AB$ was discovered by Von Decastello and Sturle $(1902)$. The blood group $O$ has no antigens in RBC but contain both antibodies in RBC.