This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Closure of Neural tube begins at which of the following level? \nSelect and explain. \nA. Cervical region, B. Thoracic region, C. Cephalic end, D. Caudal end', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fusion of neural folds begins in middle and gradually extend in cranial and caudal directions REFERENCE: TEXTBOOK OF CLINICAL EMBRYOLOGY... VISHRAM SINGH SECOND EDITION..PAGE NO:52', 'role': 'assistant'}]