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': 'Most common etiolopathogenetic cause of glaucoma is: March 2012 \nSelect and explain. \nA. Raised pressure in episcleritic veins, B. Decreased outflow, C. Increased formation of aqueous humour, D. Increased scleral outflow', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B i.e. Decreased outflow A sustained increase in intraocular pressure may be due to increased formation of the aqueous humour, difficulty in its exit, or a raised pressure in the episcleral veins of these, the first & last rarely occur, and it follows that raised intraocular pressure is essentially due to an increased resistance to the circulation of the aqueous at the pupil and/ or its drainage through the angle of the anterior chamber.', 'role': 'assistant'}]