This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Congenital CNS malformations, Subject name: Pediatrics
[{'content': 'This defect most commonly involves which region of the spine? \nSelect and explain. \nA. Cervico-dorsal, B. Dorso-lumbar, C. Lumbo-sacral, D. Atlanto-occipital', 'role': 'user'}, {'content': 'Answer: C \nExplanation: - The given image is showing a sac of meninges with some neural component inside it. So it is a meningomyelocele. - Most common location of a meningomyelocele is lumbo-sacral region.', 'role': 'assistant'}]