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': 'Controlled tipping is used as a disposal method for which of the following? \nSelect and explain. \nA. Sewage, B. Sullage, C. Refuse, D. Human excreta', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Controlled tipping or sanitary landfill is the most satisfactory method of refuse disposal when suitable land is available. 3 methods used in this are trench method, ramp method and area method. Composting is a method of combined disposal of refuse and night soil or sludge.', 'role': 'assistant'}]