This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
[{'content': 'Which of the following is the most common presentation of hemophilia A? \nSelect and explain. \nA. hematuria, B. melena, C. hemarthrosis, D. pressure neuropathy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The most common presentation is with pain in a weight-bearing joint such as the hip, knee, or ankle. Hematuria is also common. Bleeding can occur at almost any site without prior trauma.', 'role': 'assistant'}]