This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'DNA restriction fragments are separated by \nSelect and explain. \nA. Paper chromatography, B. Agarose gel electrophoresis, C. Thin-layer chromatography, D. Ultracentrifugation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Typically, a DNA molecule is digested with restriction enzymes, and the agarose gel electrophoresis is used as a diagnostic tool to visualize the fragments. An electric current is used to move the DNA molecules across an agarose gel, which is a polysaccharide matrix that functions as a so of sieve. Ref-D.M.Vasudevan 7/e p479', 'role': 'assistant'}]