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
Criteria used for diagnosing Cervical pregnancy is 
Select and explain. 
A. Studiford, B. Spigelberg, C. Wrigly, D. Rubin
D: Rubin
Answer: D: Rubin 
Explanation: Cervical ectopic pregnancyReference: Te Linde&;s Operative Gynecology, 10th Edition