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': 'Polyopia/diplopia is seen in which type of cataract- \nSelect and explain. \nA. Nuclear, B. Coical, C. Posterior subcapsular, D. Anterior polar', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In coical cataract: Uniocular polyopia (i.e., doubling or trebling of objects) occurs due to irregular refraction by the lens owing to variable refractive index as a result of cataractous process.', 'role': 'assistant'}]