This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
[{'content': 'World Tuberculosis day \nSelect and explain. \nA. March 1st, B. March 24th, C. April 1st, D. April 24th', 'role': 'user'}, {'content': 'Answer: B \nExplanation: World Tuberculosis Day, observed on 24 March each year, is designed to build public awareness about the global epidemic of tuberculosis and effos to eliminate the disease. Ref :', 'role': 'assistant'}]