This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
Which vitamin is found as a constituent of Warburg yellow enzyme - 
Select and explain. 
A. B1, B. B2, C. Niacin, D. Pantothen acid
B: B2
Answer: B: B2 
Explanation: Ans-B