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 chromatography mass movements of the substances is due to: \nSelect and explain. \nA. Diffusion, B. Electrophoresis, C. Paper chromatography, D. Osmosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Diffusion', 'role': 'assistant'}]