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
[{'content': 'The root value of axillary nerve is \nSelect and explain. \nA. C5, C6, B. C7, C8, C. C8, T1, D. C5, T1', 'role': 'user'}, {'content': "Answer: A \nExplanation: axillary nerve also known as circumflex nerve - The axillary nerve is a branch of the posterior cord of the brachial plexus and the root value is C5 , C6. Axillary or circumflex nerve is an impoant nerve because it supplies the deltoid muscle which is the main abductor of the arm. Ref : B D Chaurasia's Human Anatomy , Seventh edition, volume 1 , pg. no, 75.", 'role': 'assistant'}]