This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: TCA Cycle, Subject name: Biochemistry
Vitamins playing an impoant role in citric acid cycle: 
Select and explain. 
A. Thiamine, riboflavin, niacin, pantothenic acid, B. Thiamine, biotin, riboflavin, lipoic acid, C. Thiamine, pyridoxine, riboflavin, niacin, pantothenic, D. Thiamine, mecobalamin, pantothenic acid
A: Thiamine, riboflavin, niacin, pantothenic acid
Answer: A: Thiamine, riboflavin, niacin, pantothenic acid 
Explanation: Role of Vitamins in TCA Coenzyme Vitamin TCA cycle enzyme TPP B1 (Thiamine) * Alpha - Ketoglutarate DH * Isocitrate DH FAD B2 (Riboflavin) Succinate DH NAD B3 (Niacin) * Alpha - Ketoglutarate DH * Isocitrate DH * Malate DH Coenzyme A B5 (Pantothenic acid) Succinyl CoA