This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aerial disorders, Subject name: Surgery
[{'content': 'Which of the following statement is false regarding subclan steal syndrome ? \nSelect and explain. \nA. Most commonly stenosed vessel is Left Subclan aery ., B. Reversal of blood flow in the contralateral veebral aery ., C. Reversal is to compensate for a proximal stenosis of Subclan aery ., D. Majority cases are asymptomatic .', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most commonly involved Vessel - Left SCA > Right SCA Reversal in the blood flow in the ipsilateral veebral aery to compensate for a proximal stenosis of SCA . Majority of cases are asymptomatic but severe stenosis can lead to Transient veebrobasilar ischemia .', 'role': 'assistant'}]