This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cataract, Subject name: Ophthalmology
[{'content': 'The cataract which liquefies at an advanced stage causing lens material to liquefy and settle at the bottom is called: \nSelect and explain. \nA. Intumescent cataract, B. Coralliform cataract, C. Morgagnian cataract, D. Cupuliform cataract', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Morgagnian Cataract: Cataract liquefies after maturity and settles at the bottom. Terms Morgagnian Cataract: Cataract liquefies after maturity and settles at the bottom. Small brownish fluid settles at the bottom. Mature cataract: Whole coex becomes opacified and there is no fundal glow on retroillumination. Intumescent Cataract: Mature or diabetic cataract swells after maturation and AC becomes shallow.', 'role': 'assistant'}]