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
[{'content': 'Good vision in dim light and clusmy in day lights seen in- \nSelect and explain. \nA. Coical cataract, B. Morgagnian cataract, C. Nuclear cataract, D. Steroid induced cataract', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In cupuliform type of senile coical cataract, saucer shaped opacity develops just below the capsule usually in the central pa of posterior coex (posterior sub-capsular) which gradually extends outwards. So vision is better in dim light when pupils are dilated. Ref: AK Khurana 6thE pg189 REF IMG', 'role': 'assistant'}]