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': "All of the following clinical signs seen in Keratoconus except: \nSelect and explain. \nA. Fleischer ring, B. Rizutti sign, C. Haab's striae, D. Oil droplet reflex", 'role': 'user'}, {'content': "Answer: C \nExplanation: Haab's striae seen in primary congenital glaucoma.\nKeratoconus\n\nOil droplet reflex seen in direct ophthalmoscopy.\nRizutti sign - Light thrown temporarily falls in arrow head pattern on nasal limbus.\nFleischer ring - Iron deposition at the base of cone.", 'role': 'assistant'}]