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': 'Main motor nerve supply to the pharynx is: \nSelect and explain. \nA. Vagus nerve, B. Accessory nerve, C. Glossopharyngeal nerve, D. Facial nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]