This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification of carbohydrate, Subject name: Biochemistry
Excess of which of following can result in cataract 
Select and explain. 
A. Sugar alcohol, B. Glucose, C. Sugar amines, D. Galactose
A: Sugar alcohol
Answer: A: Sugar alcohol 
Explanation: Sugar Alcohols and cataract: = Reduction of monosaccharides forms sugar alcohols = sugar alcohols are hygroscopic in nature, absorb water, and will cause cell swelling = They especially get accumulated in the lens of the eye causing cataract. Examples: Glucose forms sorbitol in diabetes and leads to snowflake cataract In galactosemia, Excess Galactose is reduced to galactitol and give rise to oil drop cataract