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Severe haemolytic transfusion reactions commonly occur when
A. the transfused blood contains antibodies against the recipient cells.
B. the recipient has a high titre of antibodies against the donor cells.
C. Group A blood is transfused into Group AB recipients.
D. Group O blood is transfused into Group A recipients.
E. Rhesus negative blood is transfused into Rhesus positive recipients

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