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: None