This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
The most frequent cataract type seen in adult retinitis pigmentosa patient is 
Select and explain. 
A. PSC, B. Anterior polar, C. Cortical, D. Mixed
A: PSC
Answer: A: PSC 
Explanation: Ans. (a) PSCRef: Yanoff and Duker 2/e, p. 818; Kanski 7/e, p. 654* Retinitis pigmentosa is associated with posterior subcapsular cataract (PSC)Retinal pigment degeneration such as retinitis pigmentosa, Usher's syndrome and gyrate atrophy are associated with cataract, which are usually subscapular opacities.