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': 'True statement about PPV is \nSelect and explain. \nA. It increases with prevalence, B. It decreases with prevalence, C. No relation with prevalence, D. Doubles with decrease in prevalence', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]