This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral nerve injuries, Subject name: Anatomy
Autonomous zone of sensory supply by radial nerve 
Select and explain. 
A. 1st dorsal web space, B. Tip of index finger, C. Tip of thumb, D. Tip of little finger
A: 1st dorsal web space
Answer: A: 1st dorsal web space 
Explanation: Autonomous zone for radial nerve is 1st dorsal web space Refer Campbell 12th/e p 3100