This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
[{'content': 'Vitamin which is not required in the TCA cycle? \nSelect and explain. \nA. Pyridoxine, B. Niacin, C. Pantotheic acid, D. Riboflavin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vitamins, in the form of their respective coenzymes, are required for proper functioning of the TCA cycle. vitamins needed in the TCA cycle are: Thiamine as TPP Riboflavin as FAD and FMN Niacin as NAD and NADH Pantothenic acid as a pa of Coenzyme A Reference: Harpers illustrated biochemistry 30th edition', 'role': 'assistant'}]