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
The largest branch of brachial plexus is ? 
Select and explain. 
A. Ulnar, B. Medial, C. Radial, D. Axillary
C: Radial
Answer: C: Radial 
Explanation: The radial nerve is the largest branch of the posterior cord of the brachial plexus with a root value of C5-C8, T1. Ref: BD Chaurasia; Volume I; 7th edition; Page no: 57.