**Scenario:**Mr. A. Orta was in an automobile accident and suffered a superficial head wound. In the emergency room, he was stitched up and received a transfusion of blood, but surprisingly died almost immediately afterwards. Mr. Orta has type B+ blood. Receiving a transfusion of which of the following blood types would have caused his death?**Options:**- a. O-- b. O+- c. AB-- d. B-- e. B+**Note:** This is a multiple-choice question focusing on blood transfusions and compatibility, relevant for educational purposes in medical and biological sciences. Interpreting this scenario involves understanding blood type compatibility and the consequences of incompatible transfusions.

ABO blood type in the humans is regulated by three alleles of the gene I. The Rh+ and Rh- factors are independent of the ABO blood type. RBCs in humans have antigens at their surface that are recognized by the antibodies present in the blood plasma of the recipient during a blood transfusion. A person with B+ blood type has antigen B at the surface of RBCs and therefore, can receive the blood from the O (universal donor) and B blood types only. Blood type O is the universal donor and does not have any antigens at the surface of the RBCs. A person with Rh+ blood type has Rh factor present on the surface of the RBCs while the Rh- blood type lack them. Therefore, blood type B+ can get blood from B+, B-, O+ and O- blood types. However, blood type AB has both antigens B and A on the surface of the RBCs. The antigen A is recognized as foreign by the anti A antibodies present in the blood plasma of the blood type B+ to initiate the agglutination causing the death of the person. Answer: C. AB-