This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa-2 and Pa-3 (Sterilization and Bacterial Genetics), Subject name: Microbiology
Phenol Coefficient indicates - 
Select and explain. 
A. Efficiency of a disinfectant, B. Dilution of a disinfectant, C. Quantity of a disinfectant, D. Purity of a disinfectant
A: Efficiency of a disinfectant
Answer: A: Efficiency of a disinfectant 
Explanation: Phenol coefficient - Efficiency of a disinfectant is compared with that of phenol Greater the phenol coefficient , more will be efficiency of disinfectant.