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
Dermatome in the thumb and index finger region is supplied by 
Select and explain. 
A. C5,C6, B. C6,C7, C. C7,C8, D. C8,T1
B: C6,C7
Answer: B: C6,C7 
Explanation: -Thumb C6, index finger -C7 -reference: Textbook of anatomy ,Upper limb and thorax,Vishram Singh, 2nd edition, page no.85,86