This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of the Aorta, Subject name: Medicine
[{'content': 'Most common cause of aortic dissection: \nSelect and explain. \nA. Syphilis, B. Hypertension, C. Marfan syndrome, D. Cystic medial necrosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) HypertensionRef: Harrison 19th ed. /1640* 70% cases of aortic dissection occur due to hypertension. The tear occurs in tunica media and causes a tearing pain in the chest with maximum intensity in inter-scapular area. The IOC for aortic dissection is trans-esophageal echocardiography.* Marfan syndrome also can present with aortic dissection, which in fact is the leading cause of death in these patients. Syphilis involves the arch of aorta and causes an aneurysm that can rupture anyday.', 'role': 'assistant'}]