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
Fluctuating refractive errors with cataract are seen in- 
Select and explain. 
A. Morgagnian cataract, B. Diabetic cataract, C. Intumescent cataract, D. Traumatic cataract
B: Diabetic cataract
Answer: B: Diabetic cataract 
Explanation: As blood-sugar levels fluctuate, visual acuity and refractive error can chage, sometimes dramatically. Ref: Basics of vision 1st/e p.260.