Question

Which of the following blood groups is known as the 'universal donor'?

• A. O-
• B. A
• C. AB
• D. B

Answer 1

Answer:

A. O-

A universal donor is someone with the blood type O negative. Blood Types: Human blood is classified into different types based on the presence or absence of certain antigens (proteins) on the surface of red blood cells. The main blood types are A, B, AB, and O. Rh Factor: Another important factor is the Rh factor, which can be either positive (+) or negative (-).