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': 'Life span of microfilaria in human blood is \nSelect and explain. \nA. 2 Months, B. 3 Months, C. 4 Months, D. 6 Months', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Life span of micro filaria in human blood is 3 Months.', 'role': 'assistant'}]