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: Pediatrics
[{'content': "Which of the following is seen in Marfan's syndrome \nSelect and explain. \nA. Caused by mutation of fibrillin - 1 gene, B. Flat cornea seen, C. Aortic aneurysm occurs, D. All of the above", 'role': 'user'}, {'content': "Answer: D \nExplanation: Clinical features of Marfan's syndrome:\nReduced US : LS ratio\n↑ Arm span\nArachnodactyly\nAortic aneurysm\nMitral valve prolapse\nSupero - temporal dislocation of lens\nFlat cornea.", 'role': 'assistant'}]