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
Nuclear cataract is associated with: 
Select and explain. 
A. Index myopia, B. Index hypermetropia, C. Axial myopia, D. Axial hypermetropia
A: Index myopia
Answer: A: Index myopia 
Explanation: NUCLEAR CATRACT