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Question

A road accident patient with unknown blood group needs an immediate blood transfusion. His friend at once offers his blood. What was the blood group of the donor?

A
Blood group B
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B
Blood group AB
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C
Blood group O
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D
Blood group A
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Solution

The correct option is C Blood group O

Blood group is tested by two types of sera, anti-A (antibody-A) and anti-B (antibody-B). People with blood group O possess both antibodies in their plasma but have no antigens in their RBCs. So, RBCs of blood group O do not show clumping in any of the two sera. That is why, people with blood group O are called universal donor and they can donate blood to a person with any group.


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