Question

A blood group has both A and B antigens but no antibodies. It is ............... group
A) A
B) O
C) AB
D) B

Answer 1

Hint:The antigens and antibodies are present in RBC and in plasma. The RBC is the cells present in the blood and plasma is the liquid part of the blood. The antibodies are the part of the immune system which fight against foreign antigens.

Complete answer:
The blood grouping system is known as ABO blood group system. In this system four types of blood group A. B, AB, O which is named due to the presence and absence of antigens. There are two types of antigen A and B and two types of antibodies present are A and B. The similar antigen and antibody can cause agglutination for example A antigen agglutinates with A antibody. So similar antigen and antibody cannot be present in a single blood group.
Blood group A- The person with blood group A has antibody B in the plasma and antigen A in the RBC.
Blood group B- The person with blood group B has antibody A in the plasma and antigen B in the RBC.
Blood group AB- The person with blood group AB has no antibody in the plasma and only antigen A and B are present in the RBC.
Blood group O- This group has only antibodies A and B but not antigen.

Thus the correct answer is option C.

Note: The ABO blood group is very important during blood transfusion so as to prevent agglutination between similar antigen-Antibody. Blood group O is known as a universal donor as it does not contain any antigen. Blood group AB is the universal recipient as it does not have any antibody.