This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Ophthalmology
[{'content': 'All of the following are true about Keratoconus, except: \nSelect and explain. \nA. Increased curvature of cornea, B. Astigmatism, C. K.F ring cornea, D. Thick cornea', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The main pathological changes in Keratoconus are thinning and ectasia of the lens which occur as a result of defective synthesis of mucopolysaccharide and collagen tissue. REF : AK KHURANA 7TH ed.', 'role': 'assistant'}]