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 condition except - \nSelect and explain. \nA. Congential Rubella, B. Marchesani's Syndrome, C. Marfan Syndrome, D. Homocystimuria", 'role': 'user'}, {'content': "Answer: A \nExplanation: Dislocation of lens types: I. Congenital displacements: (a) Simple ectopia lentis:In this condition displacement is bilaterally symmetrical and usually upwards. It is transmitted by autosomal dominant inheritance. (b) Ectopia lentis et pupillae:It is characterised by displacement of the lens associated with slit-shaped pupil which is displaced in the opposite direction.Other associations may be cataract, glaucoma and retinal detachment. (c) Ectopia lentis with systemic anomalies are: 1. Marfan's syndrome 2. Homocystinuria 3. Weil-Marchesani syndrome. 4. Ehlers-Danlos syndrome 5. Hyperlysinaemia 6. Stickler syndrome 7. Sulphite oxidase deficiency. II. Traumatic displacement of the lens III. Consecutive or spontaneous displacement", 'role': 'assistant'}]