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': 'HDN is seen due to deficiency of vitamin: \nSelect and explain. \nA. A, B. C, C. K, D. E', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. K', 'role': 'assistant'}]