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: Surgery
[{'content': 'Which one of the following types of stomach cancers carries the best prognosis - \nSelect and explain. \nA. Superficial spreading, B. Ulcerative types, C. Linitis plastica type, D. Polypoidal type', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]