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
Ion exchange chromatography is based on 
Select and explain. 
A. Size, B. Charge, C. Solubility, D. Polarity
B: Charge
Answer: B: Charge 
Explanation: Ans. is 'b' i.e., Charge