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': 'All of the following causes excessive bleeding during tooth extraction except: \nSelect and explain. \nA. Haemophilia - A, B. Haemophilia - B, C. Anti thrombin — III deficiency, D. Von-willebrand disease', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]