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: Pathology
Which of the following is the most specific marker for Gastro Intestinal Stromal Tumor ? 
Select and explain. 
A. Desmin, B. SMA, C. DOG - 1, D. S - 100
C: DOG - 1
Answer: C: DOG - 1 
Explanation: DOG - 1 is most specific marker for GIST