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': 'Deep anterior lamellar keratoplasty is indicated in: \nSelect and explain. \nA. Disease of deeper cornea e.g. endothelial damage, B. Full thickness corneal opacities, C. Bullous keratopathy, D. Superficial corneal opacities', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Superficial corneal opacities', 'role': 'assistant'}]