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': 'An infant present with bilateral white pupillary reflex. On slit lamp examination a zone of opacity is observed arround the fetal nucleus with spoke like radial opacities. The most likely diagnosis is- \nSelect and explain. \nA. Cataracta Centralis Pulverulenta, B. Lamellar cataract, C. Coronary cataract, D. Posterior polar cataract', 'role': 'user'}, {'content': 'Answer: B \nExplanation: lamellar cataract - opacities in the foetal nucleus and which are small linear like spokes of a wheel towards the equator. Cataracta centralis pulverulenta - small rounded opacity lying exactly in the centre of the lens. Coronary cataract - opacities are often many hundreds in number and have a regular radial distribution in the periphery of lens encircling the central axis. posterior polar cataract - small circular circumscribed opacity involving the posterior pole.', 'role': 'assistant'}]