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': 'Which of the following tests is performed to assess the efficiency of pasteurization? \nSelect and explain. \nA. Phosphatase Test, B. Oxidase Test, C. Catalase Test, D. Methylene Blue Test', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Phosphatase test is a widely used test to check the efficiency of pasteurized milk. Ref: Preventive and Social Medicine, By K.Park, 19th edition, Page 522; Laboratory Diagnosis of Infectious Diseases: Essentials of Diagnostic Microbiology, By Paul G. Engelkirk, Janet Duben-Engelkirk, 2008 Lippincott Williams & Wilkins, Page 215, 216, 277.', 'role': 'assistant'}]