Multiple choice Which of the following vitamin is also known as vitamin-D? Thiamine Ergocalciferol Niacin Pantothenic acid Reveal answer Fill a bubble to check yourself B Correct answer Explanation Ergocalciferol is the chemical name for Vitamin D2, one of the main forms of Vitamin D (along with D3 or cholecalciferol). It is produced by fungi and plants when exposed to UV radiation and is used in Vitamin D supplements.