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': 'The following protein acts cGMP \nSelect and explain. \nA. Atrial natriuretic peptide, B. G-protein, C. Glycoprotein, D. Mucoprotein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Atrial natriuritic peptide is produced by hea due to increased blood pressure, it acts enzyme guanylyl cyclase and produces cGMP Ref:Guyton and Hall textbook of medical physiology 12th edition,page number: 489,490', 'role': 'assistant'}]