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 in Pulmonary Aerial Hypeension is administered: 
Select and explain. 
A. Intravenous, B. Intramuscular, C. Oral, D. Inhalation
D: Inhalation
Answer: D: Inhalation 
Explanation: 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).