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
Which amongst the following is not a branch from the root of brachial plexus? 
Select and explain. 
A. Branches to longus colli and scaleni muscles, B. Long Thoracic Nerve, C. Dorsal Scapular Nerve, D. Nerve to subclavius
D: Nerve to subclavius
Answer: D: Nerve to subclavius 
Explanation: BRANCHES FROM ROOTS ARE: Nerve to serratus anterior {long thoracic nerve}{C5-C7}. It only supplies serratus anterior muscle. Nerve to rhomboids {dorsal scapular nerve}-(C5). It supplies rhomboid major and rhomboid minor muscles. Branches to longus colli and scaleni muscles {C5-C8} and branch to phrenic nerve{C4}. Branches of trunks: Suprascapular(C5,C6) Nerve to subclan(C5, C6) REF: BD Chaurasia edition 7th page no:58.