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': 'True about vagal nuclei are all except? \nSelect and explain. \nA. There are 4 vagal nuclei, B. They are found in the floor of 4th ventricle, C. Nucleus Ambiguous is a vagal nucleus, D. Spinal trigeminal nucleus is not a vagal nucleus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is\'d\'i.e., Spinal trigeminal nucleus is not a vagal nucleus(Ref: \'Functional and chemical anatomy of the afferent vagal system". Autonomic Neuroscience. 85 (I-3): I-17.)The vagus nerve includes axons which emerge from or converge onto four nuclei of the medulla.They are present deep in the medulla in the floor of the 4th ventricle.', 'role': 'assistant'}]