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: Radiology
[{'content': 'Pleural effusion without evident lung infiltration is most often due to \nSelect and explain. \nA. Viral pleurisy, B. Lymphoma, C. Carcinoma, D. Tuberculosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Tuberculosis', 'role': 'assistant'}]