Multiple choice Which of the following transfusions is likely to cause intravascular haemolysis? Group O blood to group A recipient Group B blood to group O recipient Group O blood to group AB recipient Rh positive blood to a Rh negative donor Rh negative blood to a Rh positive donor Reveal answer Fill a bubble to check yourself B Correct answer Explanation When group B blood is transfused to group O recipient, it will cause intravascular haemolysis as the recipient has anti-B antibodies.