This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Types of Errors of Refraction, Subject name: Ophthalmology
[{'content': 'Sudden induced hypermetropia is seen in - \nSelect and explain. \nA. Trauma, B. Sudden blood sugar level change in diabetics, C. SLE, D. Rheumatoid arthritis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. Sudden blood sugar level change in diabetics o The occurrence of transitory refractive changes in diabetic patients has been recognized.o Refractive changes in diabetes are due to alterations in the power of the lens because of osmotic interactions between the lens and aqueous.o Myopia with hyperglycaemia was then explained as being due to osmotic hydration of the lens due to salt retention. Rosen accounted for hyperopia with hyperglycaemia by assuming that hydration must involve the nucleus as well.", 'role': 'assistant'}]