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: Surgery
[{'content': 'Cervical rib arises from: \nSelect and explain. \nA. C6, B. C7, C. C8, D. T', 'role': 'user'}, {'content': 'Answer: C \nExplanation: It is a Fibrous band arising from C7, which inserts on 1st thoracic rib.', 'role': 'assistant'}]