This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
[{'content': 'Staphyloma involves \nSelect and explain. \nA. Iris wth conjuctiva, B. Conjuctiva with cornea, C. Choroid with retina, D. Iris with cornea', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Staphyloma refers to a localised bulging of weak and thin outer tunic of the eyeball (cornea or sclera), lined by uveal tissue which shines through the thinned out fibrous coat. Types of staphyloma - Anterior staphyloma Intercalary staphyloma Ciliary staphyloma Equatorial staphyloma Posterior staphyloma Ref;A.K.Khurana; 6th edition; Page no:144', 'role': 'assistant'}]