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 are due to \nSelect and explain. \nA. Diffusion, B. Electrophoresis, C. Paper chromatography, D. Osmosis', 'role': 'user'}, {'content': "Answer: A \nExplanation: In chromatography, mass transfer refers to the movement of a solute through the mobile or stationary phases, i.e. net mass transfer of the solute from one phase to the other.\nTransfer of solute through a specific phase is by diffusion and is concentration driven according to Fick's law.", 'role': 'assistant'}]