Question

Which blood group is known as universal donor?

• A. A
• B. B
• C. O
• D. AB

Hint:

Blood group O → Universal donor. Blood group AB → Universal recipient.

Answer 1

The Correct Option is C

Step 1: Concept of Blood Groups:
Human blood groups are classified into A, B, AB, and O based on the presence or absence of antigens on RBCs. Step 2: Universal Donor:
Blood group O has no antigens (A or B) on its RBC surface.
Hence, it can be safely donated to people of any other blood group.
Therefore, O group is called the universal donor.
Step 3: Universal Recipient:
AB group contains both A and B antigens but no antibodies.
Therefore, AB group can receive blood from any group and is called the universal recipient.
Step 4: Final Answer:
The universal donor blood group is O.