This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Denominator of negative predictive value is \nSelect and explain. \nA. TP + FP, B. TP + FN, C. TN + FN, D. TN + FP', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Predictive value reflects the diagnostic power of the test. It&;s accuracy depends on sensitivity, specificity and disease prevalence. Predictive value of a negative test = d/(c+d)x100 Ref: 25th edition, Park&;s Textbook of Preventive and Social Medicine, Page no. 152', 'role': 'assistant'}]