This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening for Disease, Subject name: Social & Preventive Medicine
Sensitivity is - 
Select and explain. 
A. True positive/true positive + false negative, B. True positive/false positive + true negative, C. True negative/true negative + false positive, D. True negative/false negative + true positive
A: True positive/true positive + false negative
Answer: A: True positive/true positive + false negative 
Explanation: Ans. is 'a' i.e., True positive/true positive + false negative Sensitivity =Number of true positive--------------------------------------------Number of true positives + Number of false negative