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
All of the following hormones have cell surface receptors except - 
Select and explain. 
A. Adrenaline, B. Growth Hormone, C. Insulin, D. Thyroxine
D: Thyroxine
Answer: D: Thyroxine 
Explanation: Ans. is 'd' i.e., Thyroxine o Thyroxine acts on intracellular receptors.