Step 1: Role of Vitamin B1.
Vitamin B1, also known as thiamine, is a water-soluble vitamin that plays a crucial role in energy metabolism. It helps convert carbohydrates into energy and is essential for the proper functioning of the nervous system.
Step 2: Why Other Options Are Incorrect.
- (B) Riboflavin: This is Vitamin B2, which is essential for energy production and the maintenance of healthy skin, eyes, and nerves.
- (C) Niacin: This is Vitamin B3, which helps in DNA repair, skin health, and digestion.
- (D) Folic acid: This is Vitamin B9, essential for cell division and the formation of red blood cells.
Step 3: Conclusion.
Vitamin B1 is known as thiamine, so the correct answer is (A).