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
Method of chromatography in which molecules that are negatively charged are selectively released from stationary phase into the positively charged molecules in mobile phase is termed as: 
Select and explain. 
A. Affinity chromatography, B. Ion-Exchange chromatography, C. Adsorbtion chromatography, D. Size-Exclusion chromatography
B: Ion-Exchange chromatography
Answer: B: Ion-Exchange chromatography 
Explanation: B i.e. Ion-Exchange chromatography