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': 'All are infraclavicular branches of brachial plexus except? \nSelect and explain. \nA. Ulnar nerve, B. Long thoracic nerve, C. Axillary nerve, D. Thoracodorsal nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The long thoracic nerve arises from the root stage of the brachial plexus. They are present behind the scalenus anterior and scalenus medius in the neck. The ulnar nerve is a branch of the medial cord. The thoracodorsal and axillary nerve are branches of the posterior cord. The cords of the brachial plexus are formed in the cervicoaxillary canal and hence are infraclavicular in position Reference: Clinical Anatomy for students, a problem-solving approach, Neeta v Kulkarni, 2nd edition, page no.98, 99', 'role': 'assistant'}]