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': 'A patient with tubercular pleural effusion falls under category of WHO grading of TB - \nSelect and explain. \nA. I, B. II, C. III, D. IV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: <p> Tubercular pleural effusion included in new extrapulmonary TB . So it is category 1. Reference:Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:188. <\\p>', 'role': 'assistant'}]