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: Dental
Which of the following is the best method of validity? 
Select and explain. 
A. Content validity, B. Criterion validity, C. Consensual validity, D. Discriminant validity
B: Criterion validity
Answer: B: Criterion validity 
Explanation: 1. Content validity: Measurement of all variable components.
2. Consensual validity: If no. of experts agree to a parameter.
3. Criterion validity: If compared with a reference or gold standard.

It is the best measure of validity.
Usually expressed as sensitivity & specificity. 

4. Discriminant validity: If not showing a strong correlation between 2 variables.