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': 'Lens subluxation occurs in all except: \nSelect and explain. \nA. Homocystinuria, B. Ehlers-Danlos syndrome, C. Congenital syphilis, D. Congenital rubella', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Congenital rubella', 'role': 'assistant'}]