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': 'True statement about PPV is: \nSelect and explain. \nA. It increases with prevalence, B. It decreases with prevalence, C. No relation with prevalence, D. Increases incidence', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) It increases with prevalenceRef: K. Park 23rd ed. /140-141# POSITIVE PREDICTIVE VALUE* Ability of screening test to identify correctly all those who have disease out of all those who test positive on a screening test.* It depends upon sensitivity, specificity and prevalence of a disease in a population* PPV of a screening is directly proportional to prevalence of disease* If Prevalence of a disease increases in a population, PPV increase for the screening test.PPV=TP/TP+FP x 100', 'role': 'assistant'}]