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 commonest type of cataract is – \nSelect and explain. \nA. Blue dot, B. Zonular, C. Cupuliform, D. Cuneiform', 'role': 'user'}, {'content': 'Answer: D \nExplanation: You must be thinking, why not a blue dot?\nCarefully read the question. Here the question is about the commonest type of cataract (not congenital cataract).\nA most common type of cataract is senile cataract (Age-related cataract).\nA most common type of senile cataract is cuneiform cataract (70%).\n\n"In general, the predominant form can be given as cuneiform (70%), nuclear (25%), and cupuliform (5%)". — Anatomy & Physiology of eye\n"Cortical senile (Cuneiform) cataract is the most common form of senile cataract prevalent in aging population".', 'role': 'assistant'}]