This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
Spontaneous bleeding occurs when platelet count falls below: 
Select and explain. 
A. 50,000/mL, B. 40,000/mL, C. 30,000/mL, D. 20,000/mL
D: 20,000/mL
Answer: D: 20,000/mL 
Explanation: d. 20,000/mL(Ref: Wintrobes 13/689)In general, the risk of significant spontaneous hemorrhage increases gradually as the platelet count drops to <50 109/L and is high at counts <5 109/L. So among the options the best answer is 20,000/mL.