Given below from (i) to (iv) are some food items. <br> (i) Boiled and mashed potato <br> (ii) Glucose solution <br> (iii) A slice of bread <br> (iv) Mustard oil<br> Which of the above will gie blue -black colour when tested with iodine?

Question

$\begin{array}{1 1} (a)\; \text{i and ii} \\ (b)\; \text{i and iii} \\ (c)\; \text{ii and iii} \\ (d)\; \text{iii and iv} \end{array}$