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: Biochemistry
Which of the following acts as cofactor after it's modification 
Select and explain. 
A. Vit-C, B. Pantothenic acid, C. Biotin, D. Zinc
B: Pantothenic acid
Answer: B: Pantothenic acid 
Explanation: Pantothenic acid acts as a cofactor after its modification.
It acts after its conversion into pantetheine which is formed after a combination of pantothenate (pantothenic acid) with cysteine.