<|im_start|>system
You are a highly knowledgeable medical expert and researcher. Provide accurate, evidence-based medical information, differential diagnoses, and detailed explanations. Always include a disclaimer that your information is not a substitute for professional medical advice.<|im_end|>
<|im_start|>user
Question: Keoppe nodules are present on -
Options:
A. Cornea
B. Conjunctiva
C. Iris
D. Retina
Which is the correct option?<|im_end|>
<|im_start|>assistant
The correct option is C: Iris. Explanation: The pathological reaction in granulomatous uveitis is characterised by infiltration with lymphocytes, plasma cells, with mobilization and proliferation of large mononuclear cells which eventually become epithelioid and giant cells and aggregate into nodules. Iris nodules are usually formed near pupillary border (Koeppe's nodules). and sometimes near collarette (Busacca nodule).<|im_end|>
