This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins, Subject name: Biochemistry
[{'content': 'Vit K is needed for which of these post transational modification processes- \nSelect and explain. \nA. Methylation, B. Carboxylation, C. Hydroxylation, D. Transketolation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Carboxylation : " The main function of vit K is the promotion of blood coagulation by helping in the post transcriptional modification of blood factors such as II, VH,IX,X (2, 7, 9, 10) *. Vit. K functions as a coenzyme for carboxylase. This converts the glutamate residues into Gamma carboxy glutamate residues."', 'role': 'assistant'}]