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: Surgery
[{'content': "Passive forcible dorsiflexion of foot with knee extended causes pain in the calf. This is called \nSelect and explain. \nA. Moses sign, B. Homan's sign, C. Schwartz sign, D. Fegan's test", 'role': 'user'}, {'content': "Answer: B \nExplanation: Homan's sign is test for deep vein thrombosis. Passive dorsiflexion of foot with knee extended causes pain in the calf.", 'role': 'assistant'}]