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
For the determination of Threshold for diagnosis, which among these test is the best? 
Select and explain. 
A. ROC curve, B. Analysis of variants, C. Pre-test probability, D. Person Co-efficient
A: ROC curve
Answer: A: ROC curve 
Explanation: Receiver Operator Characteristic curve.