Vitamin-Bl is named so because: (A) First to be discovered in B complex vitamins, (B) First to be classified in B complex vitamins, (C) Most important vitamin for the body, (D) None of the above
Answer is A. (A) First to be discovered in B complex vitamins > Thiamine was the first of the water-soluble vitamins to be described, leading to the discovery of more such trace compounds essential for survival and to the notion of vitamin.