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': 'Causes of corneal neovascularisation \nSelect and explain. \nA. Transplantation rejection, B. Infection, C. Contact lens use, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: C i.e. Contact lens use; B i.e. Infection A i.e. Transplant rejection', 'role': 'assistant'}]