Which of the following is a hemiacetal?

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(A) hemiacetal is a functional group characterized by a carbon atom bonded to one $-OH$ group,one $-OR$ group,and two other carbon-containing groups (

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(A) hemiacetal is a functional group characterized by a carbon atom bonded to one $-OH$ group,one $-OR$ group,and two other carbon-containing groups (or hydrogen atoms). In the given options,the structure in option $A$ shows a carbon atom bonded to an $-OH$ group and an ether oxygen atom within a ring,which fits the definition of a cyclic hemiacetal.

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