This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pharmacology
Sildenafil acts by - 
Select and explain. 
A. Increasing cGMP, B. Decreasing cGMP, C. Increasing cAmp, D. Decreasing cAmp
A: Increasing cGMP
Answer: A: Increasing cGMP 
Explanation: Ans. is 'a' i.e., Increasing cGMP * Sildenafil has been explained in previous sessions