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': 'Fluctuating refractive errors with cataract are seen in - \nSelect and explain. \nA. Morgagnian cataract, B. Diabetic cataract, C. Intumescent cataract, D. Traumatic cataract', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In diabetic cataract a large number of fluid vacuoles appear under the anterior and posterior pas of the capsule, initially manifesting as myopia and then producing a diffuse opacity.', 'role': 'assistant'}]