This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
[{'content': 'Temperature of pasteurization: \nSelect and explain. \nA. 121 degrees for 15 minutes, B. 63 degrees for 30 minutes, C. 160 degrees for 1 hour, D. 140 degrees for 1 hour', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. 63 degrees for 30 minutes.a. Holder method of pasteurization-moist heat at 63 C for 30 minutesb. Flash method of pasteurization-moist heat at 72 C for 15-20 seconds followed by quickly cooling to 13 C.c. Ultra-High Temperature (UHT) of pasteurization-moist heat 140degC for 15 sec/ 149deg C for 0.5 sec.', 'role': 'assistant'}]