Which of the following is not metabolised in human body and therefore, used in determining glomerular filtration rate?

Insulin

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Inulin

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Cellulose xanthate

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Toxic ketones

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Solution

The correct option is B Inulin
Inulin is an indicator of GFR because, it is neither reabsorbed into the blood after filtration nor secreted through peritubular capillaries, amount of inulin cleared through the urine is indicative of the amount of plasma filtered by body's glomeruli.
So, the correct option is 'Inulin'.

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