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': "In `Hot air oven' for holding period of one hour, the temperature required is - \nSelect and explain. \nA. 100°C, B. 120°C, C. 140°C, D. 160°C", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]