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A person with blood group O is

Auniversal recipient
Buniversal donor
Cincompatible with all groups
Dof genotype I^A I^B
Answer & Solution
Correct answer: B. universal donor
Group O has no A or B antigens — can donate to anyone. Cannot accept any non-O blood, because O serum has both anti-A and anti-B antibodies. Universal recipient is AB.
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