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': "Carpel tunnel syndrome is caused by all except \nSelect and explain. \nA. Rheumatoid ahritis, B. Hypothyroidism, C. Addisson's disease, D. Diabetes mellitus", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref - Researchgate.net', 'role': 'assistant'}]