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': 'If the prevalence of a disease in a population increases, the predictive value of a positive test - \nSelect and explain. \nA. Increases, B. Decreases, C. Remains constant, D. Becomes compromised', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]