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': 'Vitamin k epoxide cycle is seen in \nSelect and explain. \nA. Lungs, B. Liver, C. Intestine, D. Spleen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Reference: Harpers illustrated biochemistry 30th edition', 'role': 'assistant'}]