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': 'Micro RNA transcribed by: \nSelect and explain. \nA. RNA polymerase I, B. RNA polymerase II, C. RNA polymerase III, D. DNA polymerase', 'role': 'user'}, {'content': 'Answer: B \nExplanation: RNA polymerase II', 'role': 'assistant'}]