The correct option is C Assertion is correct but Reason is incorrect
People with hemophilia experience repeated episodes of severe and prolonged bleeding at any site, with little evidence of trauma. Recurrent bleeding into joints is common, causing severe pain and, in the long term, cartilage is damaged. The two main forms of hemophilia differ only in the clotting factor involved. Haemophilia A. In this disease, factor VIII is abnormal and biologically less active. Haemophilia B (Christmas disease) is the less common sex-linked genetic hemorrhagic disease. Factor IX is deficient, resulting in the deficiency of thromboplastin. Prothrombin produced by the platelets is present in normal amounts in such condition. Thus, the correct answer is option C.