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
The erectile disorder in males is more specifically treated with which of the following agents ? 
Select and explain. 
A. Sildenafil, B. Diazepam, C. Fluoxetine, D. Zolpidem
A: Sildenafil
Answer: A: Sildenafil 
Explanation: Ans. is 'a' i.e., Sildenafil o Sildenafil, vardenafil and tadalafil are phosphodiesterase V inhibitors indicated for erectile dysfunction.