This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
[{'content': "Dislocation of lens is seen in all the following conditions except - \nSelect and explain. \nA. Congential Rubella, B. Marchesani's Syndrome, C. Marfan Syndrome, D. Homocystimuria", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Causes of ecopia lentis (dislocation or subluxation of lens) i) Homocystinuria v)Hyperlysinemia ii) Marfan syndrome vi)Sulp;hite oxidase deficiency iii)Weil-Marchesani syndrome vii)Stickler syndrome iv)Ehler Danlos syndrome viii)Trauma ix) Consecutive (Ref; Khurana 7th/e p.222 & 4th/e p.202, 203)', 'role': 'assistant'}]