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': "In a case of acute attack of glaucoma Vogt's triad excludes: \nSelect and explain. \nA. Iris atrophy, B. Goniosynechiae, C. Pigment dispersal, D. Glaucoma floaters", 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Pigment dispersal A form of open angle glaucoma characterized by disruption of the iris pigment epithelium with deposition of pigment through out the anterior segment.', 'role': 'assistant'}]