An example of a water-soluble vitamin is ___.

Thiamine, known as vitamin B1, is an example of a water-soluble vitamin. Water-soluble vitamins are those that dissolve in water and are not stored in large quantities in the body. Instead, they are expelled through urine, which means they need to be consumed regularly in our diet to maintain adequate levels. Thiamine plays a crucial role in energy metabolism and is essential for neurological function.

Other vitamins listed, such as B12, are also water-soluble; however, thiamine is often highlighted as a key example due to its fundamental role in metabolic processes. Vitamins K and E, on the other hand, are fat-soluble. Fat-soluble vitamins are stored in the body's fatty tissues and the liver, and are absorbed along with dietary fat, which differentiates them from water-soluble vitamins. Thus, thiamine serves as a clear and valid example of a water-soluble vitamin.