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: Surgery
[{'content': 'The most common site for Prolapse of interveebral disc is \nSelect and explain. \nA. Cervical region, B. Lower thoracic region, C. Upper thoracic region, D. Lumber region', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Lumbar', 'role': 'assistant'}]