This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
[{'content': 'Most common epithelial tumor of stomach: \nSelect and explain. \nA. Carcinoid, B. GIST, C. Granulose cell tumor, D. Sarcoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hyper-plastic polyp which consists of elongated, branching, dilated glandular structures is the most common epithelial tumors in the stomach (75-90% of all gastric polyps). Carcinoid is the second most common epithelial tumor of the stomach and accounts for 11-41% of all gastrointestinal carcinoids. GIST is the most common non epithelial tumour of digestive tract.stomach is the most common site', 'role': 'assistant'}]