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
[{'content': 'Commonest variety of carcinoma stomach is:(1991) \nSelect and explain. \nA. Squamous carcinoma, B. Adenocarcinoma, C. Colloid carcinoma, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: b', 'role': 'assistant'}]