This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain , Subject name: Anatomy
[{'content': '1st spinal nerve is related to \nSelect and explain. \nA. Glossopharyngeal, B. Vagus, C. Hypoglossal, D. Facial', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The anterior primary ramus of C1 joins with hypoglossal nerve, which distributes the motor fibres to the geniohyoid and thyroid muscles. C1 is the first spinal nerve which is unique in that it contains only motor fibres. (Ref: Vishram Singh textbook of clinical neuroanatomy, second edition pg 107)', 'role': 'assistant'}]