This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Ophthalmology
[{'content': 'Cornea drives its nutrition chiefly from: \nSelect and explain. \nA. Aqueous humour, B. Mucous layer, C. Corneal vessels, D. Perilimbal vessels', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cornea is avascular and dehydrated structure Gets glucose from aqueous humour Gets oxygen from 3 different source. Air Tear film Aqueous The innermost layer of the tear film is the mucous layer, which consists of secreted mucins, electrolytes and water produced by conjunctival goblet cells Mucin stabilizes the tear film', 'role': 'assistant'}]