This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
[{'content': 'Avascular coat in the eye is \nSelect and explain. \nA. Sclera, B. Cornea, C. Retina, D. Choroid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The cornea is a transparent, avascular, watch-glass like structure. It forms anterior one-sixth of the outer fibrous coat of the eyeball. It gets its nutrition from aqueous humor predominantly.Ref: Khurana; 4th edition; Pg: 89', 'role': 'assistant'}]