This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Considerations - Definition, Classification, Pathogenesis, Subject name: Ophthalmology
[{'content': 'Glaucoma is caused by - \nSelect and explain. \nA. Raised intraocular pressure, B. Raised intracranial Pressure, C. Intraocular infection, D. Orbital mass', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Raised intraocular pressure The most common risk factor known is increased intraocular pressure (lOP)o Glaucoma is a group of eye diseases causing optic nerve damage i.e., glaucoma is a chronic, progressive optic neuropathy caused by a group of ocular conditions which lead to damage of optic nerveo Optic neuropathy in glaucoma results in a characteristic appearance of optic disc and a specific pattern of irreversible visual field defects, called glaucomatous changes. It is worth noting that raised IOP without optic neuropathy is not referred to as glaucoma, it is simply called ocular hypertension.So, glaucoma is a type of optic neuropathy, which is usually caused by increased IOP.", 'role': 'assistant'}]