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: Dental
[{'content': 'Rural and Urban difference in prevalence is seen in all of the following, except: \nSelect and explain. \nA. Lung cancer, B. Tuberculosis, C. Mental illness, D. Chronic bronchitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]