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 false is ? 
Select and explain. 
A. It is longest acting phosphodiesterase inhibitor, B. It cannot be used for the treatment of PAH, C. It is used in erectile dysfunction, D. Its half life is 17-5 hours
B: It cannot be used for the treatment of PAH
Answer: B: It cannot be used for the treatment of PAH 
Explanation: Ans. is 'b' i.e., It cannot be used for the treatment of PAH Tadalafil is the longest acting phosphodiesterase inhibitor used for erectile dysfunction. Its half life is 17.5 hours. It can be used as once-daily phosphodiesterase type 5 (PDE5) inhibitor for the treatment of pulmonary aerial hypeension (PAH).