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: Physiology
[{'content': 'Steroid receptor superfamily is present in : \nSelect and explain. \nA. Vitamin D3, B. Insulin, C. Glucagon, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Vitamin D3', 'role': 'assistant'}]