Three cyclic structures of monosaccharides are given below which of these are anomers.
(i) I and II
(ii) II and III
(iii) I and III
(iv) III is anomer of I and II

Option (i) is the answer.

Anomers are cyclic configurations of monosaccharides that differ in structure at carbon-1.
I and II are anomers in this case because they differ solely in carbon-1.