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: Gynaecology & Obstetrics
[{'content': 'In abdominal pregnancy, the pathognomonlc sign is: \nSelect and explain. \nA. Jacquemier, B. Chadwick, C. Puskacek, D. Weinberg', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Weinberg', 'role': 'assistant'}]