This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mechanisms of Enzyme Action, Subject name: Biochemistry
Pyruvate dehydrogenase requires - 
Select and explain. 
A. Biotin, B. Pyridoxin, C. Folic acid, D. Pantothenic acid
D: Pantothenic acid
Answer: D: Pantothenic acid 
Explanation: Ans. is 'd' i.e., Pantothenic acid o PDH requires CoA (Coenzyme A)o Pentothenic acid is a building block of CoA.