A certain road accident patient with unknown blood group needs an immediate blood transfusion. His one doctor 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 The blood group was O. The person having O blood group is a universal donor. It lacks both antibodies 'a' and 'b' thus do not cause agglutination or clumping of blood cells when transfused into a person with any of the four blood groups.