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': 'Occupational cancer involve following organs, except: \nSelect and explain. \nA. Lung, B. Breast, C. Bladder, D. Liver', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Breast', 'role': 'assistant'}]