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
Most common cause of anterior staphyloma- 
Select and explain. 
A. High myopia, B. Scleritis, C. Corneal ulcer, D. Trauma
C: Corneal ulcer
Answer: C: Corneal ulcer 
Explanation: Anterior staphyloma. An ectasia of psuedocornea(the scar formed from organised exudates andfibrous tissue covered with epithelium) whichresults after total sloughing of cornea, with irisplastered behind it is called anterior staphyloma. REF:Comprehensive ophthalmology,20th edition,AK Khurana,pg no.122.