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
Which of the following is a characteristic feature of Moyamoya disease? 
Select and explain. 
A. Involvement of proximal internal carotid aery, B. Absence of vascular inflammation, C. Patients can be given anticoagulants without any additional risk, D. Surgical bypass from internal carotid aery to middle meningeal aery can be a treatment.
B: Absence of vascular inflammation
Answer: B: Absence of vascular inflammation 
Explanation: Answer- B. Absence of vascular inflammationOcclusive disease involving large intracranial aeries, especially the distal internal carotid aery and the stem of the middle cerebral and anterior cerebral aery.The lenticulostriate aeries develop a rich collateral circulation around the occlusive lesion, which gives the impression of a 'puff of smoke" ( moyamoya in ]apanese) on conventional x-ray angiographyOccurs mainly in Asian children or young adults.Surgical bypass of extracranial carotid aeries to the dura or MCAs may prevent stroke and hemorrhage.