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: Pathology
[{'content': 'Which is true about Haemophilia A? \nSelect and explain. \nA. Increased BT, B. Increased PT, C. Increased PTT, D. Increased platelet count', 'role': 'user'}, {'content': 'Answer: C \nExplanation: PTT is increased in haemophilia A.', 'role': 'assistant'}]