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': 'Steroid receptor regulatory protein: \nSelect and explain. \nA. Zinc finger, B. Heliz-turn -helix, C. Leucine zippor, D. RNA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Zinc finger', 'role': 'assistant'}]