Universal donor blood group is A) O

The universal donor blood group is essential for blood transfusions, as it can be given to patients of any blood type without causing adverse reactions.

Identifying the Universal Donor

The blood type that is considered the universal donor is:

• O negative

Why O Negative?

O negative blood lacks A, B, and Rh antigens, making it compatible with all other blood types. This characteristic allows it to be safely transfused to anyone in need of blood.

Other Blood Types

Here’s a brief overview of the other options:

• A) O positive: Can donate to any Rh-positive blood types but not to Rh-negative types.
• C) AB positive: Can receive blood from all types but cannot donate universally.
• D) AB negative: Can receive from all negative types but is not a universal donor.

In summary, the correct answer is B) O negative, as it is the safest choice for universal blood donation.