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
Therapeutic uses of prostaglandin E1  include all of the following; except 
Select and explain. 
A. Medical termination of pregnancy, B. Impotence, C. Primary pulmonary hypertension, D. Maintenance of patent ductus arteriosus
C: Primary pulmonary hypertension
Answer: C: Primary pulmonary hypertension 
Explanation: PGI2 analogs (like epoprostenol and treprostinil) are used for treatment of pulmonary hypertension.
PGE1 analogs are used for first trimester abortion (misoprostol), impotence (alprostadil) and maintenance of the patency of ductus arteriosus (alprostadil).