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': 'The best screening test for hemophilia ? \nSelect and explain. \nA. PT, B. CT, C. PTT, D. BT', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., PTT", 'role': 'assistant'}]