This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and Health, Subject name: Social & Preventive Medicine
[{'content': 'Reagent used to detect the microrganism in milk before pasteurization - \nSelect and explain. \nA. Crystal violet, B. Methylene blue, C. Phosphatase, D. Nitric acid', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Methylene blue 'Methylene blue Reduction test' is an indirect test for detection of microorganism in milk. It is carried out on milk prior to the process of pasterurization and is not used to check the efficiency of pasteruization.* Test to check the adequecy (efficiency) of pasteurization are: Posphatase test (m.c. used), standard plate count, and coliform count.", 'role': 'assistant'}]