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': 'Nohern blot is used for the separation of which of the following? \nSelect and explain. \nA. mRNA, B. DNA, C. Protein, D. tRNA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nohern blotting is used to estimate the gene expression estimating the expression of mRNA.', 'role': 'assistant'}]