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
Temperature required for holder method of pasteurization. 
Select and explain. 
A. 63°c for 3 min, B. 72°c for 20 sec, C. 63°c for 20 min, D. 72°c for 30 sec
A: 63°c for 3 min
Answer: A: 63°c for 3 min 
Explanation: Holder method - 63°c for  30 min
Flash method - 72°c for 20 sec