This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'All the following drugs agent by intracellular receptors except \nSelect and explain. \nA. Thyroid hormones, B. Vitamin D, C. Insulin, D. Steroids', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Intracellular receptors are receptors located inside the cell rather than on its cell membrane. Insulin is not an intracellular receptors Ref-Katzung 11/e p730', 'role': 'assistant'}]