This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Bio-Chemistry), Subject name: Biochemistry
Vitamin-Bl is named so because 
Select and explain. 
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
A: First to be discovered in B complex vitamins
Answer: A: First to be discovered in B complex vitamins 
Explanation: (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.