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': 'Which of the following is best technique to detect protein structure \nSelect and explain. \nA. Electrophoresis, B. X-ray crystallography, C. Mass spectrometry, D. Chromatography', 'role': 'user'}, {'content': 'Answer: B \nExplanation: X-ray crystallography is the best technique to detect protein structure.', 'role': 'assistant'}]