People with what blood type can give blood to anyone and are thus called universal donors

A. O-
B. O
C. AB+
D. AB-

Check Answer

The correct answer is A. O-.
People with blood type O- (O negative) are called universal donors because their blood can be given to people with any blood type, without causing an adverse reaction. This is because type O blood contains no A or B antigens on the surface of the red blood cells, which are the antigens that can trigger an immune response in someone with a different blood type. Therefore, type O- blood is considered to be a “safe” option for transfusions in emergency situations when the recipient’s blood type is unknown or cannot be quickly determined.
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