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': 'Commonly used Rodenticide is- \nSelect and explain. \nA. Zinc sulphate, B. Copper sulphate, C. Zinc oxide, D. None', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'None'", 'role': 'assistant'}]