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
The following protein acts cGMP 
Select and explain. 
A. Atrial natriuretic peptide, B. G-protein, C. Glycoprotein, D. Mucoprotein
A: Atrial natriuretic peptide
Answer: A: Atrial natriuretic peptide 
Explanation: 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