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': 'Damage to C7 nerve root causes weakness of - \nSelect and explain. \nA. Elbow flexion, B. Supination, C. Finger abduction, D. Wrist flexion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]