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
Methylene blue reduction test is done for estimating – 
Select and explain. 
A. Fat content of milk, B. Sugar content of milk, C. Protein content of milk, D. Bacterial activity in milk
D: Bacterial activity in milk
Answer: D: Bacterial activity in milk 
Explanation: None