<prompt> In Hemophilia B what is most common cause of death?HemorrhageHIV, HBV, HCV due to transfusionsTransfusion reactionsDeep vein thrombosis  <response>: 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. 