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': 'Calculate positive predictive value of ELISA test for HIV with sensitivity 99%, specificity 99%. Prevalence of HIV in population is 5/1000 \nSelect and explain. \nA. 10, B. 70, C. 34, D. 99', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]