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Question

A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive and O positive. The blood group of the adopted son is?

A A positive
B B positive
C O positive
D Cannot be determine on the basis of the given data
Answer & Explanation
Option: [C]
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