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
In chromatography, mass movements of the substances are due to 
Select and explain. 
A. Diffusion, B. Electrophoresis, C. Paper chromatography, D. Osmosis
A: Diffusion
Answer: A: Diffusion 
Explanation: 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.
Transfer of solute through a specific phase is by diffusion and is concentration driven according to Fick's law.