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': 'Strength of phenol used in disinfecting faeces is: \nSelect and explain. \nA. 5%, B. 6%, C. 8%, D. 10%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Agents used for disinfecting faeces: DISINFECTANT % USED Bleaching powder 5 Phenol 10 Cresol 5 Formalin 10 Ref: Park 21st edition, page 119.', 'role': 'assistant'}]