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: Medicine
iloprost used in pulmonary hypertension- 
Select and explain. 
A. Inhalation, B. Intravenous, C. Oral, D. Subcutaneous
A: Inhalation
Answer: A: Inhalation 
Explanation: None