This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following is used for abdominal pregnancy \nSelect and explain. \nA. Studiford criteria, B. Speigelberg criteria, C. Rubins criteria, D. Rotterdam criteria', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Studdiford criteria : To diagnose the abdominal pregnancy Both the tubes and ovaries are normal without any recent injuries Absence of uteroperitoneal fistula Presence of pregnancy related exclusively to the peritoneal surface and young enough to eliminate the possibility of secondary implantation following the primary nidation in the tube. Ref: Dutta Obs 9e pg 177.', 'role': 'assistant'}]