This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
All of the following are cause of posterior subcapsular cataract except - 
Select and explain. 
A. Myotonic dystrophy, B. Wilson's Disease, C. Ionizing radiation, D. Congenital cataract
D: Congenital cataract
Answer: D: Congenital cataract 
Explanation: Causes of posterior subcapsular cataract: Myotoic dystrophy DM Down's syndrome Busulfan, Chloroquine Ionizing radiation Senile cataract Wilson's disease Atopic dermatitis Coicosteroids Trauma Galactosemia Infrared (Ref: Parson's 22nd/e p.270 & 21st/e p.258, 260; Khurana 7th/e p.189& 4th/e p.177)