This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'Spontaneous bleeding occurs when platelet count falls below \nSelect and explain. \nA. 50,000/microL, B. 40,000/microL, C. 30,000/microL, D. 20,000/microL', 'role': 'user'}, {'content': 'Answer: D \nExplanation: >= 50,000/mL Minimal 20,000-50,000/mL Minor bleeding after trauma < 20,000/mL Spontaneous bleeding < 5000/mL Severe, possibly life-threatening spontaneous bleeding', 'role': 'assistant'}]