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: Radiology
[{'content': "'Carman meniscus sign' in barium meal is pathognomic of: September 2003 \nSelect and explain. \nA. Malignant gastric ulcer, B. Lipoma stomach, C. Gastric polyposis, D. Lymphoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Malignant gastric ulcer', 'role': 'assistant'}]