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: Pathology
What is the inheritance pattern of marfan syndrome? 
Select and explain. 
A. AD, B. AR, C. XR, D. XD
A: AD
Answer: A: AD 
Explanation: Refer the byte "Menddian disorders and their Inbetitance pattern"