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: Social & Preventive Medicine
[{'content': "Post pasteurized milk's (pally is tested by- \nSelect and explain. \nA. Phosphatase test, B. Methylene blue test, C. Catalase test, D. Oxidase test", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Phosphatase test", 'role': 'assistant'}]