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': 'Which of the following are associated with Bladder cancer \nSelect and explain. \nA. Naphthylamines, B. Nickel, C. Arsenic, D. Lead', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Now following has been mentioned as possible bladder carcinogens:\nb-napthylamines\nBenzidine\nParaamino-diphenyl\nAuramine\nMagenta', 'role': 'assistant'}]