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
If C5 ,C6 nerve root is injured, sensations of which pa of upper limb will be lost ? 
Select and explain. 
A. Thumb and index finger, B. Little finger, C. Upper medial pa of arm, D. Upper medial side of forearm
A: Thumb and index finger
Answer: A: Thumb and index finger 
Explanation: The palmar pad of thumb is innervated by C6 The pad of index finger is innervated by C7. Pad of little finger - C8 Skin on medial aspect of elbow - T1. Ref : Gray's Anatomy The Anatomical Basics of Clinical Practice 41 e pg 786.