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: Biochemistry
[{'content': 'The tertiary structure of protein is detected by \nSelect and explain. \nA. X-ray diffraction/crystallographs., B. Spectrophotometry, C. Electrophoresis, D. Chromatography', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]