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
Which morphological type of cataract is most visually handicapping ? 
Select and explain. 
A. Cortical, B. Nuclear, C. Posterior subcapsular, D. Zonular
C: Posterior subcapsular
Answer: C: Posterior subcapsular 
Explanation: Cupuliform (Posterior subcapsular) cataract lies right in the pathway of the axial rays and thus causes an early loss of visual acuity.