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': 'In thrombocytopenic purpura there is: \nSelect and explain. \nA. Increase in platelet count, B. Decrease in platelet count, C. Normal platelet count, D. Defective platelet function', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]