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 one of the following platelet counts is usually associated with increased incidence of spontaneous bleeding - \nSelect and explain. \nA. Greater tha 80,000/mm3, B. 40,000/mm3, C. 20,000mm3, D. Less than 20,000mm3', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]