This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
[{'content': 'An ectopic pregnancy is shed as \nSelect and explain. \nA. Decidua vera, B. Decidua basalis, C. Decidua capsularis, D. Decidua rubra', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The endometrial lining of the uterus is called decidua during pregnancy, If there is feilization and pregnancy occurs, the decidua differentiated intoDecidua basalis - becomes the maternal poion of the placentaDecidua - capsularis - the thin layer covering the ovumDecidua vera or parietalis - which is the rest of the decidua lining the uterine cavity outside the site of implantation.', 'role': 'assistant'}]