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': 'A 38yr old man met with a motor vehicular accident, following which he was unable to abduct his right shoulder and flex at elbow. What is the most likely cause? \nSelect and explain. \nA. Shoulder dislocation, B. Medial cord injury, C. Lateral cord injury, D. Upper trunk injury', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Upper trunk injury', 'role': 'assistant'}]