This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'At which level the somites initially form- \nSelect and explain. \nA. Thoracic level, B. Cervical level, C. Lumbar level, D. Sacral level', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The first pair of somites develop a short distance posterior to the cranial end of the notochord, and the rest of the somites from caudally.', 'role': 'assistant'}]