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 best method to differentiate proteins is by: \nSelect and explain. \nA. Gel chromatography, B. Affinity chromatography, C. Ion exchange electrophoresis, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Gel Chromotography', 'role': 'assistant'}]