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
Musculocutaneous nerve is a branch of 
Select and explain. 
A. Root of brachial plexus, B. Lateral cord of brachial plexus, C. Medial cord of brachial plexus, D. Posterior cord of brachial plexus
B: Lateral cord of brachial plexus
Answer: B: Lateral cord of brachial plexus 
Explanation: REF.BDC VOL.1,FIFTH EDITION.pg.88 The musculocutaneous nerve is the main nerve of the front of the arm and continues below the elbow as the lateral cutaneous nerve of the forearm.It is a branch of the lateral cord of the brachial plexus,arising at the lower border of the pectoralis minor in the axilla.