This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Raised aPTT is seen in all of the following bleeding disorder except: March 2009 \nSelect and explain. \nA. Hemophilia A, B. Hemophilia B, C. Von-Willebrand disease, D. Henoch - Schonlein purpura', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Henoch - Schonlein purpuraThe paial thromboplastin time (PTT) or activated paial thromboplastin time (aPTT/ APTT) is a performance indicator measuring the efficacy of both the "intrinsic" (contact activation pathway) and the common coagulation pathways. Apa from detecting abnormalities in blood clotting, it is also used to monitor the treatment effects with heparin, a major anticoagulant.', 'role': 'assistant'}]