Multiple choice general knowledge science & technology Vitamin B2 is Thiamine Calciferol Riboflavin Niacin Reveal answer Fill a bubble to check yourself C Correct answer Explanation Vitamin B2 is the chemical name for Riboflavin. Thiamine is Vitamin B1, Calciferol is Vitamin D, and Niacin is Vitamin B3. Riboflavin is essential for energy metabolism and cellular function.