This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': "Electron microscopy is diagnostic in \nSelect and explain. \nA. Good pasture's syndrome, B. Wegener's granulomatosis, C. PAN, D. Alpo's syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]