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': 'Auto claving is done in : \nSelect and explain. \nA. Dry air at 121 degree C and 15 1b pressure, B. Steam at 100 deg C for 30 minutes, C. Steam at 121 deg C for 15 minutes, D. Dry air at 160 deg C for 30 minutes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]