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': 'A new born presents with swelling in base at the spine in which meninges herniates through bony defect cause is? \nSelect and explain. \nA. Defect in pedicle, B. Defect in body, C. Defect in fusion of veebral arches, D. Defect in transverse process', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Spina bifida occurs when local regions of the neural tube fail to fuse or there is failure in formation of the veebral neural arches .', 'role': 'assistant'}]