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': 'The aminoacid carboxylated by vitamin K is \nSelect and explain. \nA. Histidine, B. Aspartate, C. Proline, D. Glutamate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Vitamin\xa0 K\xa0 acts as a coenzyme for the carboxylation\xa0 of glutamic\xa0 acid residues present in the proteins and this reaction is catalysed by\xa0 a\xa0 carboxylase (microsomal).\nRef : Satyanarayana, 3rd ed, pg 130', 'role': 'assistant'}]