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
Alprostadil is not used for - 
Select and explain. 
A. Erectile dysfunction, B. Pulmonary hypeension, C. Patent ductus aeriosus, D. Critical limb ischemia
C: Patent ductus aeriosus
Answer: C: Patent ductus aeriosus 
Explanation: Ans. is 'c' i.e., Patent ductus aeriosus o Alprostadil is used to keep the ductus open and not to treat patent ductus aeriosus.