The universal donor is blood type:

The universal donor is blood type:
A . B
B . O
C . A
D . D

View Answer

Answer: B

Explanation:

The universal donor blood type is O negative (O-). This means that individuals with this blood type can donate blood to recipients of any other blood type. This is due to the absence of A and B antigens on the red blood cells and the lack of Rh antigen, which prevents the immune system of the recipient from recognizing the donor blood as foreign. The concept of universal donor is fundamental in emergency situations when there’s no time to cross-match blood types.

Reference: American Red Cross. (n.d.). Understanding Blood Types.

Mayo Clinic. (n.d.). Blood Types and Compatibility.