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
The following tests are used to check the efficiency of pasteurization of milk except : 
Select and explain. 
A. Phosphatase test, B. Standard plate count, C. Coliform count, D. Methylene blue reduction test
D: Methylene blue reduction test
Answer: D: Methylene blue reduction test 
Explanation: Methylene blue Reduction test is a indirect test for detection of microorganism in milk. It is carried out on milk prior to the process of pasteurization and is not used to check the efficiency of pasteurization. Ref: Alcamo's Laboratory Fundamentals of Microbiology By Jeffrey Pommerville, 2010, Page 297