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': 'Hemophilia is associated with: \nSelect and explain. \nA. Normal bleeding time normal clotting time, B. Normal bleeding time prolonged clotting time, C. Prolonged bleeding time normal clotting time, D. Prolonged bleeding time prolonged clotting time', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]