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
Gastrointestinal stromal malignancy arises from which of the following ? 
Select and explain. 
A. Smooth muscle, B. Nerve cells, C. Interstitial cells of Cajal, D. Vascular Endothelium
C: Interstitial cells of Cajal
Answer: C: Interstitial cells of Cajal 
Explanation: Ans. is 'c' i.e., Interstitial cells of Cajal