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': 'A test was considered for diagnosing a disease. Out of 80 positive cases with this test, 40 actually had no disease. Out of 9920 tested negative cases 9840 actually had no disease. Calculate the sensitivity of the test - \nSelect and explain. \nA. 13%, B. 33%, C. 50%, D. 99%', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 33%", 'role': 'assistant'}]