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: Surgery
[{'content': "Inferior alveolar nerve block is absolutely\ncontraindicated in patients suffering from one of the following diseases: \nSelect and explain. \nA. Thrombocytopenia, B. Hemophilia, C. Hypoprothrombinemia, D. Von willebrand's disease", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]