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': 'Criteria used for diagnosing Cervical pregnancy is \nSelect and explain. \nA. Studiford, B. Spigelberg, C. Wrigly, D. Rubin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cervical ectopic pregnancyReference: Te Linde&;s Operative Gynecology, 10th Edition', 'role': 'assistant'}]