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
[{'content': 'Hour glass deformity is seen in - \nSelect and explain. \nA. Carcinoma stomach, B. Peptic ulcer, C. Duodenal atresia, D. CHPS', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hour glass stomach\xa0is caused due to cicatracia contraction of a saddle shaped ulcer at the lesser curvature.', 'role': 'assistant'}]