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
[{'content': 'The most frequent cataract type seen in adult Retinitis pigmentosa patient is – \nSelect and explain. \nA. PSC, B. Anterior polar, C. Cortical, D. Mixed', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Retinitis pigmentosa is associated with posterior subcapsular cataract (PSC).\n\n"Retinal pigment degenerations such as retinitis pigmentosa , Usher\'s syndrome and gyrate atrophy are associated with cataract, which are usually subcapsular opacities".\n\n—Yanoff & Duker', 'role': 'assistant'}]