Question

The b vitamin content of a whole grain is dramatically decreased during the refining process. to counteract these losses, in the united states, food manufacturers are required to enrich breads and cereals from milled, refined grains with which b vitamins

Answer 1

In the United States, food manufacturers are required to enrich breads and cereals from milled, refined grains with the following vitamin B: THIAMIN, RIBOFLAVIN AND NIACIN. 
Bran, which is the outer layer of grain is rich in B vitamins and some other nutrients and minerals, but these usually get lost during refining process. Due to this, the government requires grain food manufacturers to add some B vitamins to their products during production. The B vitamins are very essential in man's nutrient because of their many benefits.