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': "The first sign of Volkman's ischemia is: \nSelect and explain. \nA. Paresthesia, B. Pain on passive extension of fingers, C. Pain on active extension of fingers, D. Swelling of fingers", 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. pain on passive extension of finger', 'role': 'assistant'}]