This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
What is the numerator in the calculation the sensitivity of a test 
Select and explain. 
A. True-Positive, B. true-negative, C. False-Positive, D. False-Negative
A: True-Positive
Answer: A: True-Positive 
Explanation: Sensitivity = number of true positives / number of true positives + number of false negativesSpecificity = number of true negatives / number of true negatives + number of false positives