Which group is absent in the structure of ste | vedclass

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(D) Sterols are a subgroup of steroids with a hydroxyl group at the $C-3$ position and a hydrocarbon chain at the $C-17$ position. They are characteri

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Both $(b)$ and $(c)$

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(D) Sterols are a subgroup of steroids with a hydroxyl group at the $C-3$ position and a hydrocarbon chain at the $C-17$ position. They are characterized by a steroid nucleus consisting of four fused rings. In the basic structure of sterols,the carboxyl group $(-COOH)$ and the carbonyl group $(>C=O)$ are typically absent. Therefore,both $(b)$ and $(c)$ are absent in the basic sterol structure.

Column-$I$	Column-$II$
$(a)$ Fat	$(i)$ All fatty acids are saturated and long-chained
$(b)$ Oil	$(ii)$ All fatty acids are unsaturated and short or long-chained
$(c)$ Wax	$(iii)$ Alcohol molecule is monohydroxy alcohol
$(d)$ Complex lipid	$(iv)$ Lipid plus non-lipid component

Which group is absent in the structure of sterols?

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