This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Pasteurization is ____________ disinfection \nSelect and explain. \nA. Precurrent, B. Concurrent, C. Preconcurrent, D. Terminal', 'role': 'user'}, {'content': "Answer: A \nExplanation: Disinfection of milk by pasteurization, water by chlorine and handwashing may be cited as examples of precurrent infection. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 140", 'role': 'assistant'}]