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': 'PT is used to test ? \nSelect and explain. \nA. Extrinsic and common pathway, B. Intrinsic and common pathway, C. Intrinsic pathway, D. Extrinsic pathwa', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Extrinsic and common pathway Patients with hemophilia have deficiency of factor VIII that results in prolonged PTT.", 'role': 'assistant'}]