Which blood type is called the universal donor?
A) type A
B) type B
C) type O
D) type AB
C) type O
Type O blood does not have any markers, so it will not react with anti-A or anti-B
antibodies, which makes persons with type O blood universal donors. Persons with type A or
type B blood types are not universal donors. Persons with type AB blood are known as universal
recipients because AB blood does not have antibodies against the other types.
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