This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Placenta - Types and their complications, Subject name: Gynaecology & Obstetrics
[{'content': 'Which layer of placenta disappears at the end of pregnancy? \nSelect and explain. \nA. Decidua perietalis, B. Decidua capsularis, C. Decidua basalis, D. Chorion frondosum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Decidua directly beneath blastocyst implantation is modified by trophoblast invasion and becomes the decidua basalis. Decidua basalis disappears at the end of pregnancy. Decidua parietalis is also called as decidua vera', 'role': 'assistant'}]