Two unconscious patients X and Y whose blood group genotypes are AO and AB respectively were transfused with the blood from the same donor . Patient X immediately showed signs of difficulty in breathing while patient Y showed no negative reaction.
What should the hospital have done to prevent X from showing the symptom described above? Patient X should have
A undergone an agglutination test
B been asked for the blood group
C been screened for HIV
D undergone malaria test
Answer is A
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