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: Pathology
[{'content': 'Predisposing factor for venous thrombosis: \nSelect and explain. \nA. AT III deficiency, B. Protein S deficiency, C. Protein C deficiency, D. Dysfibrinogenemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Dysfibrinogenemia produces hypercoagulable state and leads to thrombus formation in some patients. Other causes have already been discussed.', 'role': 'assistant'}]