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': 'Rural and urban population differ in incidence in all diseases except \nSelect and explain. \nA. Bronchitis, B. TB, C. Lung Cancer, D. Mental illness', 'role': 'user'}, {'content': "Answer: B \nExplanation: Non modifiable risk factors : age, sex, family history, Genetic factors and personality.\n—Park's textbook of preventive and social medicine 23rd edition", 'role': 'assistant'}]