This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening, Subject name: Social & Preventive Medicine
[{'content': 'Most number of false positives by a screening test is becuase of? \nSelect and explain. \nA. High specificity, B. High sensitivity, C. High prevalence, D. Low prevalence', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref :Parks 23rd edition pg 140. PPV decreases as prevalence decreases. As PPV decreases it means that TP is decreasing. This is accompanied by an increase in FP PPV =TP /(TP +FP)', 'role': 'assistant'}]