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': 'Tyndallization involves steaming at \nSelect and explain. \nA. 100°C for 20 min for 3 consecutive days, B. 121°C for 15 min for 3 consecutive days, C. 126°C for 2 mins for 3 consecutive days, D. < 100°C for 20 mins', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tyndallization involves steaming at 100°C for 20 minutes for 3 consecutive days.\nUsed for sterilization of gelatin and egg serum or sugar contaning media.', 'role': 'assistant'}]