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
Tadalafil inhibits 
Select and explain. 
A. PDE - 3, B. PDE - 4, C. PDE - 5, D. PDE - 6
C: PDE - 5
Answer: C: PDE - 5 
Explanation: Tadalafil & Sildenafil inhibits Phosphodiesterase - 5 (PDE -5) and increase cGMP, They are used in pulmonary hypertension & erectile dysfunction.