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What is correct for blood group 'O' : -
A
No antigens but both a and b antibodies are present
B
A antigen and b antibody
C
Antigen and antibody both absent
D
A and B antigens and a, b antibodies
Detailed Solution
Blood group O has neither antigen A nor antigen B on the RBCs.
Its plasma contains both anti-A (a) and anti-B (b) antibodies.
(Group A has antigen A and anti-B; group AB has both antigens and no antibodies.)
So group O has no antigens but both a and b antibodies.
Its plasma contains both anti-A (a) and anti-B (b) antibodies.
(Group A has antigen A and anti-B; group AB has both antigens and no antibodies.)
So group O has no antigens but both a and b antibodies.