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: Pharmacology
Nitric oxide produces its anti–aggregatory action by increasing the levels of 
Select and explain. 
A. cAMP, B. cGMP, C. ADP, D. Phosphoinositol
B: cGMP
Answer: B: cGMP 
Explanation: None