This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Rideal-Walker coefficient is related with? 
Select and explain. 
A. Disinfect ing power, B. Parasitic clearance, C. Dietary requirement, D. Statistical correlation
A: Disinfect ing power
Answer: A: Disinfect ing power 
Explanation: testing of disinfectants Phenol test ,riedal walker test are used to determine the efficacy of disinfectants In Riedal walker test,suspension containing equal number of typhoid bacilli are submitted to the action of varying concentration of phenol and of the disinfectant to be tested REF:Ananthanarayan and Panicker's Textbook ofMicrobiology 8thEdition pg no:38