This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inflammations of the Cornea, Subject name: Ophthalmology
[{'content': 'Corneal ulcer leads to? \nSelect and explain. \nA. Anterior staphyloma, B. Posterior staphyloma, C. Lenticomus, D. Keratoconus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Anterior staphylomaRef: Khurana 4/e, p 510', 'role': 'assistant'}]