This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
[{'content': 'Iloprost in pulmonary aerial hypeension is administered \nSelect and explain. \nA. Intravenous, B. Intramuscular, C. Oral, D. Inhalation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref Harrison 19 th ed pg 1666 Iloprost is a prostacyclin analogue approved inhalation for treatment of pulmonary aerial hypeension (PAH) Epoprostinil as iv treprostinil as oral /iv/SC/inhalation.', 'role': 'assistant'}]