This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'How to test for the long thoracic nerve? \nSelect and explain. \nA. Touch the opposite shoulder, B. Shoulder shrug, C. Raise the arm above the head, D. Lift an object from the ground', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Long thoracic nerve innervates Serratus anterior.\xa0Serratus anterior originates from outer surface of upper 8 ribs and inserts onto inferior angle and medial border of scapula.\nActions\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0It rotates the scapula to help in overhead abduction.\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0Steady the scapula to carry weight.\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0Pushing of arm forward in horizontal position.\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0Helps in forced inspiration.', 'role': 'assistant'}]