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: Anatomy
Most appropriate marker of GIST 
Select and explain. 
A. CD 117, B. CD 34, C. CD 23, D. S-100
A: CD 117
Answer: A: CD 117 
Explanation: Refer Robbins page no 789-790 Cd117 is the most impoant diagnostic marker is detectable in 95 percnt of the patients