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': 'A 75–year old patient presents with deterioration of vision. On examination the pupillary reflex is observed to be sluggish and the Intraocular pressure is normal. Optic disc evaluation shows a large and deep cup and primarily shows paracentral scotomas. The most likely diagnosis is – \nSelect and explain. \nA. Primary Narrow Angle glaucoma, B. Normal Tension Glaucoma, C. Neovascular Glaucoma, D. Absolute Glaucoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Glaucomatous cupping (large and deep cup) along with glaucomatous visual field defect (paracentral scotomas are the most frequent) in a patient with normal intraocular pressure suggest a diagnosis of Normal Tension Glaucoma (NTG).', 'role': 'assistant'}]