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: Pharmacology
Which of the following most accurately describes the trans membrane signalling process involved in the steroid hormone action? 
Select and explain. 
A. Action on a membrane spanning tyrosine kinase, B. Action of a G protein, which activates or inhibits adenylyl cyclase, C. Diffusion across the membrane and binding to an intracellular receptor, D. Opening of transmembrane ion channels
C: Diffusion across the membrane and binding to an intracellular receptor
Answer: C: Diffusion across the membrane and binding to an intracellular receptor 
Explanation: None