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': 'Denominator in negative predictive value ? \nSelect and explain. \nA. True positive + false positive, B. False negative + true positive, C. True negative + false positive, D. True negative + false negative', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., True negative + false negative", 'role': 'assistant'}]