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': 'Lung cancer is an industrial hazard in/for – \nSelect and explain. \nA. Chimney sweepers, B. Aniline industry, C. Gas industry, D. Benzol industry', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]