This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Prevalence of tuberculosis infection is determined by - \nSelect and explain. \nA. Sputum examination, B. Mantoux, C. Clinical examination, D. MMR', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The tuberculin (Mantoux) test is the only means of estimating the prevalence of infection in a population . Ref:PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page 185', 'role': 'assistant'}]