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
Nerve root for dermatome supplying thumb and index finger: 
Select and explain. 
A. C6 C7, B. C6 C6, C. C7 C8, D. C5 C6
B: C6 C6
Answer: B: C6 C6 
Explanation: Ans. b. C6 C6