What blood type is considered the universal donor?

A) O
B) A
C) B
D) AB
E) All blood types are considered universal donors.

Universal Donor

A term often associated with blood type O negative, referring to individuals whose red blood cells can be transfused into persons of any other blood type without causing an adverse reaction.

Blood Type

The classification of human blood based on the presence or absence of inherited antigenic substances on the surface of red blood cells.