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
True about intracellular receptors: 
Select and explain. 
A. Mainly on nuclear surface, B. GH act on it, C. Estrogen does not act on it, D. All
A: Mainly on nuclear surface
Answer: A: Mainly on nuclear surface 
Explanation: A i.e. Mainly on nuclear surface