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
ANF is mediated by (ANF: Atrial natriuretic factor): 
Select and explain. 
A. Inositol phosphate, B. DAG, C. CyAMP, D. CyGMP
D: CyGMP
Answer: D: CyGMP 
Explanation: D i.e. CyGMP