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': 'Special visceral efferent fibres for muscles located in which nuclie: \nSelect and explain. \nA. Lacrimatory nucleus, B. Motor nucleus, C. Nucleus of tractus solitarus, D. Nucleus ambiguous', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]