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 given population of 1000, new cases of lung cancer is 50, old cases in the same population are 100. What is the prevalence \nSelect and explain. \nA. 1.50%, B. 15%, C. 150, D. 13%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]