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
A most common cause of posterior staphyloma – 
Select and explain. 
A. Trauma, B. Glaucoma, C. Myopia, D. Scleritis
C: Myopia
Answer: C: Myopia 
Explanation: Degenerative high axial myopia is the most common cause of posterior staphyloma.