This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Link reaction, Subject name: Biochemistry
Pyruvate dehydrogenase multienzyme complex carries out all the following reactions EXCEPT: 
Select and explain. 
A. A decarboxylation reaction, B. Produce a molecule of ATP, C. Produce an acetyl group from pyruvate, D. Combine the acetyl group with a cofactor
B: Produce a molecule of ATP
Answer: B: Produce a molecule of ATP 
Explanation: PDH reaction Oxidative decarboxylation reaction (option a is correct) Pyruvate is conveed to acetyl-CoA - (option c is correct) Acetyl group is combined with CoA cofactor - (option d is correct) NADH is produced in PDH reaction. No substrate level production of ATP - (option b is wrong)