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: Microbiology
Rideal Walker test is used to determine the efficiency of the 
Select and explain. 
A. Disinfectant, B. Moist heat sterilisation, C. Antibiotics, D. Dry heat sterilization
A: Disinfectant
Answer: A: Disinfectant 
Explanation: None