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: Social & Preventive Medicine
[{'content': 'What strength of phenol may be used for disinfection of faeces? \nSelect and explain. \nA. 1%, B. 2.50%, C. 5%, D. 10%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Usage of phenol Recommended strength Decontamination of faeces 10% Mopping of floor and cleaning of drains 5% Bacteriostatic 0.5% Ref : Park 21st edition, page 117', 'role': 'assistant'}]