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
The drug which can be used to delay the progression of aoic dilatation in marfan syndrome is: 
Select and explain. 
A. Propranolol, B. Vitamine E, C. ACE inhibitor, D. Idebenone
A: Propranolol
Answer: A: Propranolol 
Explanation: Propranolol is used to lower blood pressure and thereby delay or prevent aoic dilation. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 3213