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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

  1. (a)O positive
  2. (b)A positive
  3. (c)B positive
  4. (d)Cannot be determined on the basis of the given data
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Official answer(a) O positive