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': 'In a village of 1 lakh population, among 2,000 exposed to smoking, 20 developed lung cancer and among 8,000 unexposed people, 8 developed lung cancer. What is attributable risk - \nSelect and explain. \nA. 10%, B. 50%, C. 90%, D. 100%', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 90%", 'role': 'assistant'}]