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
Hypovitaminosis D causes – 
Select and explain. 
A. Zonular cataract, B. Blue – Dot cataract, C. Rosette cataract, D. Cupuliform cataract
A: Zonular cataract
Answer: A: Zonular cataract 
Explanation: Hypocalcaemia (Hypoparathyroidism, hypovitaminosis D) causes zonular (lamellar) cataract.