Why is Type O Blood Called the Universal Donor

Question

Why is type O blood called the universal donor?
A)Because everyone with type O blood is Rh-, and therefore, this blood type cannot initiate any transfusion reactions
B)Because type O blood plasma does not contain anti-A or anti-B antibodies, so it can be transfused into recipients of any blood type
C)Because everyone with type O blood is Rh+, like most of the population, so this blood type is compatible with all others
D)Because type O red blood cells contain neither antigen A nor antigen B, so they can be transfused into most recipients of any blood type, without being attacked by antibodies
E)It is not well understood why type O blood can be transfused into people with all blood types.

Accepted Answer

Type O blood is considered the universal donor because it lacks both antigen A and antigen B on its red blood cells, making it less likely to be attacked by antibodies in any recipient's system.