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A certain road accident patient with unknown blood group needs immediate blood

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

Options

(a) Blood group B
(b) Blood group AB
(c) Blood group O
(d) Blood group A

Correct Answer:

Blood group O

Explanation:

Blood group O acts as universal donor.

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