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Question

Which of the following is correct for blood group 'O'?

A
No antigens but both a and b antibodies are present
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B
A antigen and b antibody both are present
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C
Antigen and antibody are both absent
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D
A and B antigens and a,b antibodies are present
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Solution

The correct option is A No antigens but both a and b antibodies are present
There are 4 main blood groups A, B, AB and O. Your ABO blood type is based on the presence or absence of the A and B antigens on your red blood cells.

A person who has blood group O will have no antigens, but both antibodies a and b are present against the blood groups A and B.
A person who has A blood group will have A antigens and b antibodies
A person who has B blood group will have B antigens and a antibodies.
A person who has AB blood group will have only A and B antigens and no antibodies

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