This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Platelet & Coagulation disorders, Subject name: Medicine
In Hemophilia B what is most common cause of death? 
Select and explain. 
A. Hemorrhage, B. HIV, HBV, HCV due to transfusions, C. Transfusion reactions, D. Deep vein thrombosis
A: Hemorrhage
Answer: A: Hemorrhage 
Explanation: Hemophilia B- inherited, X-linked recessive disorder resulting in deficiency of functional plasma coagulation factor IX. Morbidity and death are primarily the result of hemorrhage, although infectious diseases (e.g., HIV, hepatitis) also has some role.