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
Protein fragments separation is/are done by: 
Select and explain. 
A. Ultrafiltration, B. Chromatography, C. Centrifugation, D. All
D: All
Answer: D: All 
Explanation: All Correct : Chromatography, Centrifugation, Ultrafiltration, Electrophoresis