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': 'Cyclic GMP act on : \nSelect and explain. \nA. Insulin, B. Thyroxin, C. Atrial natriuretic peptide, D. Growth harmone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Atrial natriuretic peptide', 'role': 'assistant'}]