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': 'Linitis plastica is a type of : \nSelect and explain. \nA. Gastric ulcer, B. Ca stomach, C. Duodenal ulcer, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Linitis plastica is a subtype of gastric cancer that is characterized by diffuse infiltrating adenocarcinoma without obvious caers and ulcers. It is thought to originate from parietal cell poion of gastric mucosa. Because of its diffuse nature ,this form of gastric cancer ususally involves the whole stomach. Ref : Clinical Scenarios in Surgical Oncology edited by Vijay P. Khatri', 'role': 'assistant'}]