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: Radiology
In leukemia patient, post extraction bleeding doesn't stop because of: 
Select and explain. 
A. Increased leukocyte count, B. Increased Ca+ level in blood, C. Platelet disorder, D. Deficiency of clotting factors
C: Platelet disorder
Answer: C: Platelet disorder 
Explanation: None