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': 'In brachial plexus nerve arising from root is \nSelect and explain. \nA. Nerve to serratus anterior, B. Axillary nerve, C. Ulnar nerve, D. Suprascapular nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nerve to serratus anterior or long thoracic nerve arises from the nerve root of C5-C7. Injury to this nerve causes the condition called winging of scapula due to paralysis of serratus anterior muscle. B D Chaurasia 7th edition Page no: 45', 'role': 'assistant'}]