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
The best method to differentiate proteins is by: 
Select and explain. 
A. Gel chromatography, B. Affinity chromatography, C. Ion exchange electrophoresis, D. None of the above
A: Gel chromatography
Answer: A: Gel chromatography 
Explanation: A i.e. Gel Chromotography