This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
[{'content': 'Phenol coefficient indicates: \nSelect and explain. \nA. Efficacy of a disinfectant, B. Dilution of a disinfectant, C. Quantity of a disinfectant, D. Purity of a disinfectant', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Efficacy of a disinfectant Phenoliccoefficientofatestdisinfectant=PhenolthatkillsS.Typhiinagivensametime (Highestdilution)DisinfectantthatkillsS.typhiinagiventime (Highestdilution)", 'role': 'assistant'}]