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': 'All of the following are true about phrenic nerve,except - \nSelect and explain. \nA. It is purely motor nerve, B. It arise briefly from C4 spinal nerve, C. It is formed at the lateral order of scalenus anterior, D. Accessory phrenic is commonly a branch from the nerve to subclavius', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Phrenic nerve arises from ventral rami of C3-5 and had both motor and sensory branches.', 'role': 'assistant'}]