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
[{'content': 'Which coenzyme is responsible for carboxylation reaction \nSelect and explain. \nA. Biotin, B. FAD, C. NADH, D. Thiamine pyrophosphate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Biotin acts as coenzyme for carboxylases.', 'role': 'assistant'}]