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: Pathology
[{'content': 'Amyloid material can be best diagnosed by: \nSelect and explain. \nA. Polarized microscopy, B. Electron microscopy, C. X-ray crystallography, D. Scanning electron microscopy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]