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
Best endometrial reaction In ectopic pregnancy is : 
Select and explain. 
A. Arias stella reaction, B. Secretory phase, C. Decidual reaction without chorionic villi, D. Decidual reaction with chorionic villi
C: Decidual reaction without chorionic villi
Answer: C: Decidual reaction without chorionic villi 
Explanation: Decidual reaction without chorionic villi