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
Causes of corneal neovascularisation 
Select and explain. 
A. Transplantation rejection, B. Infection, C. Contact lens use, D. All
D: All
Answer: D: All 
Explanation: C i.e. Contact lens use; B i.e. Infection A i.e. Transplant rejection