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
Cause of ITP is 
Select and explain. 
A. Vasculitis, B. Antibody to vascular epithelium, C. Antibody to platelets, D. Antibody to clotting factors
C: Antibody to platelets
Answer: C: Antibody to platelets 
Explanation: None