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: Medicine
[{'content': 'Most common manifestation of severe hemophilia A is \nSelect and explain. \nA. Retroperitoneal hemorrhages, B. Recurrent heamarthrosis, C. Recurrent muscle bleeding, D. Recurrent bleeding from gums', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Recurrent heamarthrosis is a common manifestation of moderate / severe disease.', 'role': 'assistant'}]