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?

Blood group B

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Blood group AB

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Blood group O

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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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