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: Microbiology
[{'content': 'Simple Iife cycle requires - \nSelect and explain. \nA. One host, B. Two host, C. Three host, D. Four host', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]