There cyclic structures of monosaccharides are given below which of these are anomers.

(1) I and II     (2) II and III
(3) I and III    (4) III is anomer of I and II

Hint: Anomers differ from each other in their structure at first carbon

Anomers  are the cyclic structures of monosaccharides which differ in the structure at carbon-1 are known as anomers.

Here, I and ll are anomer because they differ from each other at carbon- 1 only.