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
[{'content': 'Nothern blot is used for the separation of which of the following? \nSelect and explain. \nA. mRNA, B. DNA, C. Protein, D. Protein DNA interaction', 'role': 'user'}, {'content': "Answer: A \nExplanation: Nohern Blotting shows a blotting technique that can determine the size of an mRNA and tell us about its expression patterns. Ref: Harper's Illustrated Biochemistry 27th Edition, Page 409, 410; Cell Biology: A Sho Course By Stephen R. Bolsover, Elizabeth A. Shephard, Hugh A. White, Jeremy S. Hyams, 2011, Page 113.", 'role': 'assistant'}]