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
[{'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: Answer is D (Inhalation): European Society of Cardiology (ESC) Guidelines for the diagnosis and treatment of pulmonary hypeension Iloprost is a Prostacyclin analogue approved inhalation for treatment of Pulmonary Aerial Hypeension (PAH).', 'role': 'assistant'}]