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
[{'content': 'Corneal vascularisation is/are caused by –a) Graft rejectionb) Chemical burnc) Contact lens used) Vitreous haemorrhagee) Viral infection \nSelect and explain. \nA. bcde, B. abce, C. acde, D. abde', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]