Question

if a person is injured and has type a blood, what type(s) of blood would the doctor be able to give them in order to keep them alive?
type a, b, ab, or o
type a or type o
type a only
type a or type ab

Explanation:

Blood type compatibility depends on antigens and antibodies. Type A blood has A antigens on red blood cells and anti-B antibodies in plasma. It can receive blood with no conflicting antigens: Type A (matches antigens) and Type O (universal donor, no A/B antigens). Type B has B antigens that would react with anti-B antibodies, and Type AB has B antigens that would also trigger a reaction.

Answer:

Type A or Type O