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
All are neural crest derivatives except? 
Select and explain. 
A. Cauda equina, B. Adrenal medulla, C. Melanoblasts, D. Odontoblasts
A: Cauda equina
Answer: A: Cauda equina 
Explanation: 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