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': "In patients of acquired immunodeficiency syndrome, the commonest cause of space occupying lesion in brain is - \nSelect and explain. \nA. Non Hodgkin's lymphoma, B. Cytomnegalovirus infection, C. Cryptoccosis, D. Toxoplasmosis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]