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': 'Disposal of placenta at PHC is \nSelect and explain. \nA. Treat with bleaching powder and burial, B. Deep burial, C. Boiling, D. Dry burning', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Animal wastes (category 2) are disposed by incineration or Deep burial.', 'role': 'assistant'}]