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: Medicine
[{'content': 'Nothern blot is used for the separation of: \nSelect and explain. \nA. mRNA, B. DNA, C. Protein, D. Protein DNA interaction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. m- RNA', 'role': 'assistant'}]