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
Which type of congenital cataract presents with a disc of opacity involving the fetal and embyonal nucleus with many white dots looking like dust? 
Select and explain. 
A. Lamellar cataract, B. Punctate cataract, C. Pulverulent cataract, D. Coronary cataract
C: Pulverulent cataract
Answer: C: Pulverulent cataract 
Explanation: Cataract centralis pulverulenta (Embryonic nuclear cataract) -It has dominant genetic trait and occurs due to inhibition of the lens development at a very early stage and thus, involves the embryonic nucleus. -The condition is bilateral and is characterised by a small rounded opacity lying exactly in the centre of the lens. -The opacity has a powdery appearance (pulverulenta) and usually does not affect the vision.