This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Best disinfectant of cholera stool is- \nSelect and explain. \nA. Bleaching powder, B. Cresol, C. Phenol, D. Lime', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cresol is an excellent coal-tar disinfectant. It is 3 to 10 times as powerful as phenol, yet no more toxic. Cresol is best used in 5 to 20 percent strength for disinfection of farces and urine. Cresol is an all-purpose general disinfectant. (refer pgno :128 park 23 rd edition)', 'role': 'assistant'}]