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': 'Polychromatic lusture is seen in \nSelect and explain. \nA. Zonular cataract, B. Posterior subscapular cataract, C. Nuclear cataract, D. Anterior subscapular cataract', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Polychromatic luster is a pathognomic feature of complicated cataract which is most commonly posterior subcapsular Refer: Khurana 6th edition page number 187', 'role': 'assistant'}]