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
All are benign mesenchymal tumours of stomach except - 
Select and explain. 
A. Leiomyoma, B. Adenoma, C. Fibroma, D. Lipoma
B: Adenoma
Answer: B: Adenoma 
Explanation: Ans. is 'b' i.e., Adenoma