4. in an emergency situation, a person with blood type a could receive
type a blood only.
o type o blood only.
o type a or type o blood.
o type a or type ab blood.

In an emergency situation, a person with blood type A could receive type A  or type O blood.

Explanation

Blood type A has anti-B antibody in the plasma and O type blood has no antigens. The presence or absence of antigens determine the blood group of individual. The O group is free of antigens and does not trigger an immune reaction in the body and hence are also known as universal donor.

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i guess you forgot putting it.

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