This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cerebrovascular Diseases, Subject name: Surgery
[{'content': 'Commonest site of meningocele is:- \nSelect and explain. \nA. Lumbosacral, B. Occipital, C. Frontal, D. Thoracic', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A fluctuant midline mass , that may transilluminate occurs along the veebral column , in the LOWER BACK. Most common site is Lumbo Sacral region . Most meningoceles are well covered with skin & pose no threat to the patient .', 'role': 'assistant'}]