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
The formula denotes - 
Select and explain. 
A. Sensitivity, B. Specificity, C. PPV-Positive Predictive Value, D. NPV-Negative Predictive Value
B: Specificity
Answer: B: Specificity 
Explanation: None