This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'Commonly used Rodenticide is - \nSelect and explain. \nA. Zinc phosphide, B. Copper sulphate, C. Zinc oxide, D. Ferrous sulphate', 'role': 'user'}, {'content': "Answer: A \nExplanation: Commonly used rodenticides: Barium carbonate Zinc phosphide Warfarin, diphacinone, coumafuryl, and pindone in multiple doses Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 847", 'role': 'assistant'}]