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
All the following hormones bind to cell surface receptors of the target tissues EXCEPT 
Select and explain. 
A. Thyroid stimulating hormone, B. Glucagon, C. Estrogen, D. Epinephrine
C: Estrogen
Answer: C: Estrogen 
Explanation: None