A 22 year old man presents with history of bleeding from gums for the last 6 months. On investigation the b was found to be 8.2 gm% TLC 4400/mm, DLC N 64%, L 27%, E 3%, M 6% and platelet count of 20,000 /cu mm. Which one of the following investigation would be most useful in establishing the diagnosis -: (A) Bleeding time and clotting time, (B) Prothrombin time, (C) Partial thromboplastin time, (D) Bone marrow examination
Answer is D. None