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': "Ectopia lentis is seen in all of the following except: March 2007 \nSelect and explain. \nA. Marfan's syndrome, B. Homocystinuria, C. Weil-Marchesani syndrome, D. Down syndrome", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. D: Down syndrome Ectopia lentis is a displacement or malposition of the eye's crystalline lens from its normal location. More common: Marf an syndrome Homocystinuria Weil-Marchesani syndrome Sulfite oxidase deficiency Hyperlysinemia Less common: Ehlers-Danlos syndrome Crouzon disease Refsum syndrome Sturge-Weber syndrome Pierre Robin syndrome", 'role': 'assistant'}]