Correct Answer - B
Starch `(C_(6)H_(10)O_(5))_(n)` is a polysaccharide. It consists of two fractions `-` one is known as `alpha-`amylose or amylopectin. In iodimetric and iodometric titrations, starch solution is used as an indicator . It gives blue or violet colour with free iodine. At the end point, the blue or violet colour disappears when iodine is completely changed to iodide.