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': 'Megalocornea is associated with A/E - \nSelect and explain. \nA. Down syndrome, B. Turner syndrome, C. Marfan syndrome, D. Ehler danlos syndrome', 'role': 'user'}, {'content': "Answer: B \nExplanation: Megalocornea is labelled when thehorizontal diameter of cornea is of adult size at bihor 13 mm or greater after the age of 2 years. The corneais usually clear with normal thickness and vision. Thecondition is not progressive. Systemic associationinclude Marfan's, Ape, Ehlers Danlos and Downsyndromes. REF:Comprehensive ophthalmology,20th edition,AK Khurana,pg no.91.", 'role': 'assistant'}]