The correct answer is: Salt.
Food fortification is the process of adding essential nutrients to foods that are consumed in large quantities on a regular basis. This is done to improve the nutritional quality of the food and to prevent or reduce the risk of nutrient deficiencies.
In Tamil Nadu, food fortification is done by adding iron and iodine to salt. This is done to prevent or reduce the risk of iron deficiency anemia and iodine deficiency disorders, respectively.
Iron deficiency anemia is a condition in which the body does not have enough healthy red blood cells. This can cause symptoms such as fatigue, shortness of breath, and pale skin. Iodine deficiency disorders can cause a number of problems, including mental retardation, goiter, and deafness.
Food fortification is an effective way to improve the nutritional status of the population. It is a safe and affordable way to provide essential nutrients to people who may not be getting enough of them from their diet.
The other options are incorrect because they are not foods that are commonly fortified with essential nutrients. Rice, milk, and edible oil are all important sources of nutrients, but they are not fortified with iron and iodine in Tamil Nadu.