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
The ability of a test to detect true negatives is: 
Select and explain. 
A. Sensitivity, B. Specificity, C. PPV, D. NPV
B: Specificity
Answer: B: Specificity 
Explanation: Ref: 21st edition Park. Pg 128Explanation:SensitivityAbility of the test to identify true positivesSpecificityAbility of the test to identify true negativesPositive predictive valueProbability that a patient with positive test result truly has the diseaseNegative predictive valueProbability that a patient with negative test result truly does not have the disease