This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
[{'content': 'Dermatome in the thumb and index finger region is supplied by \nSelect and explain. \nA. C5,C6, B. C6,C7, C. C7,C8, D. C8,T1', 'role': 'user'}, {'content': 'Answer: B \nExplanation: -Thumb C6, index finger -C7 -reference: Textbook of anatomy ,Upper limb and thorax,Vishram Singh, 2nd edition, page no.85,86', 'role': 'assistant'}]