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': 'You have been referred a middle–aged patient to rule out open angle glaucoma. Which of the following findings will help in the diagnosis – \nSelect and explain. \nA. Cupping of the disc, B. Depth of anterior chamber, C. Visual acuity and refractive error, D. Angle of the anterior chamber', 'role': 'user'}, {'content': 'Answer: A \nExplanation: At least two of the following three are required to make a diagnosis of POAG :-\n\n\n\nRaised IOP (>21 mmHg) on more than one occasion and a circadian variation in TOP > 8 mmHg.\nGlaucomatous changes in optic disc (including cupping of disc)\nVisual field changes.', 'role': 'assistant'}]