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's meniscus sign is seen in \nSelect and explain. \nA. Benign Gastric ulcer, B. Malignant Gastric ulcer, C. Both, D. Intestinal obstruction", 'role': 'user'}, {'content': "Answer: B \nExplanation: Benign ulcer - Hampton's ulcer.\nMalignant ulcer - Carman's Meniscus sign.", 'role': 'assistant'}]