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
Nuclear cataract can cause- 
Select and explain. 
A. Myopia, B. Hyperopia, C. Presbyopia, D. Astigmatism
A: Myopia
Answer: A: Myopia 
Explanation: Nuclear cataract causes index myopia. Ref: Duker 21st/e p.412.