This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aneurysms and Dissections, Subject name: Pathology
[{'content': 'Most common cause of dissecting hematoma - \nSelect and explain. \nA. Hypertension, B. DM, C. Trauma, D. Mafan syndrome', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Hypertension o More than 90% of dissections occur in men between the age of 40 and 60 with antecedent hypertension.Other causes of dissection.o Marfan syndrome causing cystic medial necrosis (second most common),o Ehlers - Danlos syndrome.o Inflammatory aortitis - Takayasu's disease. Giant cell arteritis,o Coarctation of aorta.o Normal woman during third trimester of pregnancy.3 Congenital bicuspid aortic valve.Also knowo In Aortic dissection blood enters alon the laminar planes of media.", 'role': 'assistant'}]