This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening, 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: Ref :Parks 23rd edition pg 139 Sensitivity = TP / (TP + FP) = 40 / (40+80)=. 33', 'role': 'assistant'}]