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: Medicine
[{'content': 'True about Haemophilia A are all except \nSelect and explain. \nA. PTT increased, B. PT increased, C. Clotting time is increased, D. Serum levels of factor VIII are decreased', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer is B (PT is increased): It is PTT which is affected (increased) and not PT (unaffected). Haemophilia A occurs due to deficiency or reduced activity of factor VIII (antihaemophilic factor). Factor VIII is involved in the intrinsic pathway which is measured by PTT and not in extrinsic pathway which is measured as PT.', 'role': 'assistant'}]