This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology and Rheumatology, Subject name: Medicine
[{'content': "See the fig below. What is your diagnosis? \nSelect and explain. \nA. Cataract, B. Wilson's disease, C. Ankylosing spondylitis, D. Behcet syndrome", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. B. Wilson's diseaseKayser-Fleischer rings at the junction of the cornea and sclera (arrow) in a patient with Wilson's disease.", 'role': 'assistant'}]