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': 'All are neural crest derivatives except? \nSelect and explain. \nA. Cauda equina, B. Adrenal medulla, C. Melanoblasts, D. Odontoblasts', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mnemonic:SOME GAP S-Schwann cells -Skeleton of face O-odontoblasts M-Meninges(pia and arachnoid) E-Endocardial cushion G-Ganglia(autonomic and dorsal root ganglia) A-Adrenal medulla -Aoicopulmonary septum P-Pigmant cells(melanocytes) -Pharyngeal arches(nerves and cailage) -parafollicular c cells of thyroid', 'role': 'assistant'}]