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
All the following are biotin independent carboxylation reactions, EXCEPT 
Select and explain. 
A. Addition of CO2 to from C6 in purine ring, B. Conversion of pyruvate to malate by malic enzyme, C. Acetyl CoA carboxylase, D. Carbamoyl phosphate synthetase
C: Acetyl CoA carboxylase
Answer: C: Acetyl CoA carboxylase 
Explanation: The  conversion of  pyruvate to  oxaloacetate by  biotin  dependent  pyruvate  carboxylase is essential for the synthesis of glucose from  many non-carbohydrate sources.