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
[{'content': "Which of the following acts as cofactor after it's modification \nSelect and explain. \nA. Vit-C, B. Pantothenic acid, C. Biotin, D. Zinc", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pantothenic acid acts as a cofactor after its modification.\nIt acts after its conversion into pantetheine which is formed after a combination of pantothenate (pantothenic acid) with cysteine.', 'role': 'assistant'}]