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: Medicine
[{'content': 'Which is most likely to be increased in Vit K deficiency - \nSelect and explain. \nA. P. T. T., B. P.T., C. Platelet count, D. Fibrinogen time', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]