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A person of which of the following blood groups is called a universal donor?

AO

BAB

CA

DB

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Answer and explanation

Correct Answer: A: O

Explanation: The correct answer is A: O. A person with blood group O is called a universal donor. Type O negative blood can be donated to patients of any blood type, making it invaluable in emergency situations when there is no time to determine a patient's blood type.

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