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: Ophthalmology
[{'content': "Koeppe's nodules: \nSelect and explain. \nA. Are a feature of nongranulomatous iridocyclitis, B. Are situated at the pupillary border, C. Consist of polymorphonuclear cells, D. Do not initiate posterior synechiae formation", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Are situated at the pupillary border', 'role': 'assistant'}]