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: Medicine
Methylene blue test is used to detect 
Select and explain. 
A. Microorganisms, B. Sucrose, C. Fats, D. All of the above
A: Microorganisms
Answer: A: Microorganisms 
Explanation: Methylene blue test is used to detect Microorganisms.