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
[{'content': 'A characteristic of Diagnostic test (as compared to Screening test) is: \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]