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': 'All are sanitary methods of refuse disposal except \nSelect and explain. \nA. Composting, B. Stacking, C. Incineration, D. Land filling', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]