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
Coenzyme responsible for carboxylation reaction is: 
Select and explain. 
A. Biotin, B. FAD, C. NADH, D. Thiamine pyrophosphate
A: Biotin
Answer: A: Biotin 
Explanation: Biotin