This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous System, Subject name: Pediatrics
[{'content': '1 month old baby brought by the mother complaining of a mass on back associated with wetness and inability of both legs to move ever since birth. Possible diagnosis? \nSelect and explain. \nA. Pilonidal cyst, B. Spina bifida, C. Meningomyelocele, D. Sacrococcygeal teratoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Meningomyelocele style="font-size: 1.04761904761905em; color: rgba(0, 0, 0, 1); font-family: Times New Roman, Times, serif; margin: 0 0 8pt">', 'role': 'assistant'}]