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
[{'content': 'All of the following hormones have receptors on the cell surface, EXCEPT: \nSelect and explain. \nA. Adrenalin, B. Growth Hormone, C. Insulin, D. Thyroxine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hormones act on their specific receptors located on or within their target cells. Receptor activation by hormones is translated into response in a variety of ways. Thyroxine hormone has its receptor within the nucleus. This hormone penetrates the nucleus -> combines with its receptor --> alter DNA-RNA mediated protein synthesis. Ref: Essentials of Medical Pharmacology, 5th Edition, Page 214', 'role': 'assistant'}]