This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Cyclic GMP act on \nSelect and explain. \nA. Thyroxine, B. Insulin, C. Growth hormone, D. Atrial natriuretic peptide', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cyclic GMP is the secondary messager for ANP, nitric oxide Secondary messager is required for peptide hormones Ref:Guyton and Hall textbook of medical physiology 12th edition ,pag number:540,541,542', 'role': 'assistant'}]