This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Definition and Concepts, Examples from NHPs, Subject name: Social & Preventive Medicine
A characteristic of Diagnostic test (as compared to Screening test) is: 
Select and explain. 
A. Test results are arbitrary and final, B. Based on one criterion or cut-off point, C. Less accurate, D. Done on those with indications or sick
D: Done on those with indications or sick
Answer: D: Done on those with indications or sick 
Explanation: None