A person with unknown blood group under $A B O$ system, has suffered much blood loss in an accident and…

A person with unknown blood group under $A B O$ 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?
  1. Type $A B$
  2. Type $\mathrm{O}$
  3. Type $\mathrm{A}$
  4. Type B

Solution

Blood type ' $\mathrm{O}$ ' has no any antigen but both types of antibodies ' $a$ ' and ' $\mathrm{b}$ '. The person with blood type ' $O$ ' is universal donor.

Asked in: NEET 2011 (Screening)

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