This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
[{'content': 'Treatment option for glaucoma includes all except- \nSelect and explain. \nA. Trabeculectomy, B. Trabeculotomy, C. Vitrectomy, D. Viscoanulostomy', 'role': 'user'}, {'content': "Answer: C \nExplanation: Surgical removal of the vitreous is now not an infrequently performed procedure. TYPES 1. Anterior vitrectomy. It refers to removal of anterior pa of the vitreous. 2. Core vitrectomy. It refers to removal of the central bulk of the vitreous. It is usually indicated in endophthalmitis. 3. Subtotal and total vitrectomy. In it almost whole of the vitreous is removed. TECHNIQUES Open-sky vitrectomy This technique is employed to perform only anterior vitrectomy. Indications \x01 Vitreous loss during cataract extraction. \x01 Aphakic keratoplasty. \x01 Anterior chamber reconstruction after perforating trauma with vitreous loss. \x01 Removal of subluxated and anteriorly dislocated lens. Closed vitrectomy (Pars plana vitrectomy) Pars plana approach is employed to perform core vitrectomy, subtotal and total vitrectomy. Indications \x01 Endophthalmitis with vitreous abscess. \x01 Vitreous haemorrhage. \x01 Proliferative retinopathies such as those associated with diabetes, Eales' disease, retinopathy of prematurity and retinitis proliferans. \x01 Complicated cases of retinal detachment such as those associated with giant retinal tears, retinal dialysis and massive vitreous traction. \x01 Removal of intraocular foreign bodies. \x01 Removal of dropped nucleus or intraocular lens from the vitreous cavity. \x01 Persistent primary hyperplastic vitreous. \x01 Vitreous membranes and bands. Ref.AK Khurana 4th edition page no 246", 'role': 'assistant'}]