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': "Fundoscopic examination of a child shows salt and pepper appearance. He probably has: \nSelect and explain. \nA. Toxocara, B. Marfan's syndrome, C. Prenatal toxoplasma, D. Prenatal rubella", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Differential diagnosis of salt and pepper appearance of fundus: Prenatal rubella Prenatal influenza Varicella Mumps Congenital syphilis Ref: Comprehensive Ophthalmology by AK Khurana, 4th edition, Page 495.', 'role': 'assistant'}]