This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cataract, Subject name: Ophthalmology
Not a cause of congenital cataract: 
Select and explain. 
A. Trisomy 21, B. Stickler syndrome, C. Lowe's syndrome, D. Marfan's syndrome
D: Marfan's syndrome
Answer: D: Marfan's syndrome 
Explanation: Marfan's syndrome is associated with subluxation of lens as a result of zonular weakness and not congenital cataract. Cataract may develop earlier in the subluxated lens as compared to others of same age but not congenital cataract. Stickler Syndrome is associated with quadrantic lamellar cataract though less common. CAUSES OF CONGENITAL CATARACT: Maternal malnutrition, infantile malnutrition- (Zonular cataract). Maternal infection e.g. (like rubella, toxoplasmosis, CMV). Placental hemorrhage. Drugs :Thalidomide, Coicosteroid. Congenital Syndromes: Down's, Hallerman Streiff, Lowe, Galactosemia, trisomy 13-15, cockayne, Trisomy 21, Goldenhar, Cerebro oculo facial syndrome. Congenital condition like Aniridia.