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(A) The blood group $O$ is known as the universal donor because individuals with blood group $O$ do not have $A$ or $B$ antigens on the surface of the

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Blood group $O$

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(A) The blood group $O$ is known as the universal donor because individuals with blood group $O$ do not have $A$ or $B$ antigens on the surface of their red blood cells (RBCs). Therefore,their blood can be safely transfused into individuals of any other blood group ($A, B, AB,$ or $O$) without causing an immune reaction. In emergency situations where the patient's blood group is unknown,$O$ negative blood is typically preferred,but generally,blood group $O$ is the correct answer for a universal donor.

$A$ person injured in a road accident does not have a known blood group and requires an immediate blood transfusion. $A$ doctor friend offers to donate blood immediately. What would be the blood group of this doctor?

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