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
Corneal vascularisation is/are caused by –a) Graft rejectionb) Chemical burnc) Contact lens used) Vitreous haemorrhagee) Viral infection 
Select and explain. 
A. bcde, B. abce, C. acde, D. abde
B: abce
Answer: B: abce 
Explanation: None