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
Fundoscopic examination of a child shows salt and pepper appearance. He probably has: 
Select and explain. 
A. Toxocara, B. Marfan's syndrome, C. Prenatal toxoplasma, D. Prenatal rubella
D: Prenatal rubella
Answer: D: Prenatal rubella 
Explanation: 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.