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': 'In a population of 5000, number of new cases of TB is 500; old cases in the same population are 150. What is the prevalence of TB: \nSelect and explain. \nA. 9%, B. 12%, C. 13%, D. 18%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) 13%Ref: K. Park 23rd ed. / 61* Prevalence is calculated asNo. of new cases + no of old casesTotal Populationx 100* Therefore prevalence =500 + 1505000x 100* Prevalence =13%Also Know* Prevalence is a Proportion* Incidence is a Rate', 'role': 'assistant'}]