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': 'The dreaded complication of Rituximab is: \nSelect and explain. \nA. Progressive multifocal leukoencephalopathy, B. AIDP, C. Bone marrow suppresion, D. Cardiac toxicity', 'role': 'user'}, {'content': "Answer: A \nExplanation: The dreaded complication of Rituximab is progressive multifocal leukoencephalopathy Ref: Harrison's principles of internal medicine, 18th edition ; Page 882.", 'role': 'assistant'}]