This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Air, Light, Sound, Housing, Radiation, Waste Disposal, Subject name: Social & Preventive Medicine
Pasteurized milk is most commonly tested by? 
Select and explain. 
A. Phosphatase test, B. Coliform test, C. Catalase test, D. Oxidase Test
A: Phosphatase test
Answer: A: Phosphatase test 
Explanation: Phosphatase test is conducted on pasteurized milk to detect the presence of heat-labile phosphatase enzyme in pasteurized milk.