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': 'Finger by which all three major nerves of the upper limb can be tested - \nSelect and explain. \nA. Index, B. Ring, C. Thumb, D. Middle', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]