This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bleeding Disorders, Subject name: Pathology
Spontaneous bleeding usually occurs when the platelet counts fall below 
Select and explain. 
A. 20000/uL, B. 50000/uL, C. 100000/uL, D. 120000/uL
A: 20000/uL
Answer: A: 20000/uL 
Explanation: Ans. (a) 20000/uL(Ref: Robbins 9th/pg 662; 8th/pg 692)In general, the risk of significant spontaneous hemorrhage increases gradually as the platelet count drops to <50x109/L and is high at counts <5x109/L. So among the options the best answer is 10,000/ul.