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': 'A 37-year-old woman presented with symptoms consistent with allergic conjunctivitis, but was found to have this incidental finding. What is the diagnosis? \nSelect and explain. \nA. Aniridia, B. Prominent iris collarette, C. Coloboma of the iris, D. Granulomatous iritis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer B. Prominent iris collaretteThe diagnosis is a protruding or prominent iris collarette. The finding was detected on slit-lamp examination. The iris collarette is a landmark that separates the central pupillary zone from the peripheral ciliary zone. It is typically flat but can be prominent, as seen here. This finding is a normal variant; it is benign and requires no treatment.', 'role': 'assistant'}]