There is no sugar in urine but the blood entering the kidney has more sugar than that leaving the kidney because

Sugar is absorbed by proximal convoluted tubule

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Sugar is used by kidney cells in metabolism

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Sugar is absorbed in Loop of Henle

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Sugar is absorbed by bladder

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Solution

The correct option is A Sugar is absorbed by proximal convoluted tubule
The most important work of kidney is to extract waste from blood, balance body fluids, form urine and aid in other important functions of the body. Usually urine contains no sugar but the blood entering the kidney has more sugar than leaving the kidney because sugar is filtered through glomerulus but it is reabsorbed in PCT.

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