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': 'Beta naphthyl-amines is associated with cancer of: \nSelect and explain. \nA. Bladder, B. Oral, C. Liver, D. none of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bladder cancer is known to be associated with aniline industry. Chemicals mentioned as bladder carcinogens are benzidine, auramine, magenta, beta naphthylamines and para amino diphenyl. Ref: Park 21st edition, page: 748.', 'role': 'assistant'}]