This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
[{'content': 'Glaucoma flecken is \nSelect and explain. \nA. Acute uveitis due to glaucoma, B. Lens opacity due to glaucoma, C. Retinal detachment due to glaucoma, D. Corneal opacity due to glaucoma', 'role': 'user'}, {'content': "Answer: B \nExplanation: Vogt's triad may be seen in patients with any type of post congestive glaucoma and in treated cases of acute congestive glaucoma. It is characterized by: _ Glaucoma flecken (anterior subcapsular lenticular opacity), _ Patches of iris atrophy, and _ Slightly dilated non-reacting pupil (due to sphincter atrophy). Glaukomflecken are gray-white epithelial and anterior coical lens opacities that occur following an episode of markedly elevated IOP , Ref: Khurana; 4th edition; Pg. 230", 'role': 'assistant'}]