This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Pediatrics
[{'content': 'Ectopia lentis in a child is seen in which of the following disease? \nSelect and explain. \nA. Sarcoidosis, B. Homocystinuria, C. Alkaptonuria, D. Wilson disease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]