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
[{'content': "Most common cause of dissecting hematoma is because of - \nSelect and explain. \nA. Hypertension, B. Marfan's, C. Iatrogenic, D. Kawasaki", 'role': 'user'}, {'content': 'Answer: A \nExplanation: More than 90% of dissections occur in men between the ages of 40 and 60 with antecedent hypertension.', 'role': 'assistant'}]