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': 'In which type of chromatography, the proteins are bound to another substance: \nSelect and explain. \nA. Hydrophobic chromatography, B. Affinity chromatography, C. Paper chromatography, D. Gel chromatography', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Affinity chromatography', 'role': 'assistant'}]