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': 'Which cervical nerve supplies the thumb dermatome \nSelect and explain. \nA. C5/T1, B. C6, C. C7, D. C8', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]