Blood type ' O ' has no any antigen but both types of antibodies ' a ' and ' b '. The person with blood type ' O ' is universal donor.
A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?
Held on 30 Apr 2011 · Verified 9 Jul 2026.
Type AB
Type O
Type A
Type B
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