This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea, Subject name: Ophthalmology
[{'content': 'Not true regarding corneal stroma \nSelect and explain. \nA. Measures 500 um, B. Type 1 collagen is most abundant, type 4 & 6 also found, C. Transmits 90% of incoming light, D. Derives its oxygen from aqueous humor', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Corneal Stroma * Thickest layer of the cornea * Measures 500 um * Type 1 collagen is most abundant, type 4 & 6 also found.Type 2 collagen is not found * Transmits 90% of incoming light * Derives its oxygen from precorneal tear film and not aqueous humor * MMP 2 is found in human stroma * Acellular & lamellar orientation of collagen fibres accounts for its transparency', 'role': 'assistant'}]