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
Validity of an indicator means 
Select and explain. 
A. It should actually measure what it is supposed to measure, B. The answer should be same if measured by different persons in similar circumstances, C. Indicators should reflect changes in the situation concerned, D. Indicators should have ability to obtain data needed
A: It should actually measure what it is supposed to measure
Answer: A: It should actually measure what it is supposed to measure 
Explanation: Ref:Parks 23rd edition pg 138 validity refers to what extend the test accurately measures what it purpos to measure. Validity includes - sensitivity and specificity.