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 following may be used in erectile dysfunction except - 
Select and explain. 
A. Phenylephrine, B. Apomorphine, C. Alprostidil, D. All
A: Phenylephrine
Answer: A: Phenylephrine 
Explanation: Ans. is 'a' i.e., Phenylephrine Drugs used in erectile dysfunction Phosphodiesterase-5 inhibitors (Siledenafil, Todafil, Vardenafil). Alprastadil (Prostaglandin El) Papaverine Androgens Apomorphine