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 of the following may present with isolated prolongation of prothrombin time (PT): \nSelect and explain. \nA. Factor VIII deficiency, B. Factor VII deficiency, C. Factor XII deficiency, D. Factor IX deficiency', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer is B (Factor VII deficiency) Factor VII deficiency may present with isolated prolongation of prothrombin time. Deficiency of factor VIII, IX and XII may present with isolated prolongation of Paial Thromboplastin Time (APTT) and not isolated prolongation of prothrombin time (PT) Cause of Isolated prolongation of PT (CMDT) Vitamin K deficiency Warfarin therapy Liver disease Factor VII deficiency', 'role': 'assistant'}]