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
[{'content': 'For the determination of Threshold for diagnosis, which among these test is the best? \nSelect and explain. \nA. ROC curve, B. Analysis of variants, C. Pre-test probability, D. Person Co-efficient', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Receiver Operator Characteristic curve.', 'role': 'assistant'}]