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': 'Injury to long thoracic nerve. It can be tested by asking the patient \nSelect and explain. \nA. Resistance against wall, B. Raise the arm above head, C. Touch opposite shoulder, D. Lift a heavy object.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Long thoracic nerve supplies the serratus anterior muscle, which helps in overhead abduction of shoulder, pushing and punching movements. So it can be tested by asking the patient for forward pressure with the hands against a wall, or against resistance offered by the examiner. B D Chaurasia 7th edition Page no : 46,47', 'role': 'assistant'}]