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': 'More false positive cases in a community signify that the disease has \nSelect and explain. \nA. High sensitivity, B. High specificity, C. community has high prevalence, D. community has low prevalence', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref:Parks 23rd edition pg 138 Low prevalence gives more false positive test results. Note : PPV increases as prevalence increases. PPV decreases as prevalence decreases.', 'role': 'assistant'}]