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
[{'content': 'All of the following hormones have cell surface receptors except: \nSelect and explain. \nA. Adrenalin, B. Growth Hormone, C. Insulin, D. Thyroxine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]