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
cGMP is second messenger for which hormone(s): 
Select and explain. 
A. Somatostatin, B. Atrial natriuretic factor, C. Angiotensin II, D. Antidiuretic hormone (ADH)
B: Atrial natriuretic factor
Answer: B: Atrial natriuretic factor 
Explanation: B i.e. Atrial natriuretic factor