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: Forensic Medicine
[{'content': 'Cause of Berry aneurysm: AIIMS 11 \nSelect and explain. \nA. Degeneration of internal elastic lamina, B. Degeneration of media/muscle cell layer, C. Deposition of mucoid material in media, D. Low grade inflammation of vessel wall', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Degeneration of media/muscle cell layer', 'role': 'assistant'}]