This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Pathology
Best marker for GIST is 
Select and explain. 
A. CD117, B. DOG 1, C. CD 34, D. CD 43
A: CD117
Answer: A: CD117 
Explanation: Diagnostic markers GISTs and cajal cells express c-KIT (also known as CD117) and CD34. Most useful diagnostic marker is c-KIT and immunohistochemically detected in 95% of gastric GISTs GENERAL AND SYSTEMIC PATHOLOGY RAMDAS NAYAK FIRST EDITION PAGE 390