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: Medicine
[{'content': 'True regarding presentation of primary T.B. is - \nSelect and explain. \nA. B/L pleural effusion with negative Tuberculin test., B. U/L hilar lymphadenopathy, C. Sustained chronic pyrexia, D. B/L pelural effusion with positive tuberculin test.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]