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: Biochemistry
In the physiologic system, nitric oxide is known to act through 
Select and explain. 
A. Cyclic AMP, B. Calcium ions, C. Cyclic GMP, D. Prostacyclins
C: Cyclic GMP
Answer: C: Cyclic GMP 
Explanation: None