Iodine gives a red colour with

(A) Starch

Iodine gives a blue-black color when it reacts with starch. The reaction with starch is commonly used as a test to identify the presence of starch in a solution.

Iodine gives a red color with dextrin. This is in contrast to the blue-black color it gives with starch and the reddish-brown color it gives with glycogen.

Glycogen