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
Steroid receptor superfamily is present in : 
Select and explain. 
A. Vitamin D3, B. Insulin, C. Glucagon, D. All
A: Vitamin D3
Answer: A: Vitamin D3 
Explanation: A i.e. Vitamin D3