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
[{'content': 'From which of the following layers the regeneration of endometrium take place : \nSelect and explain. \nA. Zona basalis, B. Zona pellucidum, C. Zona compacta, D. Zona spongiosum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Zona basalis Endometrium Superficial layer (2/3) Deep layer (1/3) It consists of stratum compactum stratum spongiosum These Layers are supplied by sprial which undergo vasocostriction during secretory phase | This causes necrosis or sloughing of these layers at the time of menstruation Stratum basale (Zona basalis) it is supplied by basllar aeries | During secretory phase these basilar aeries remain straight, so the blood supply stratum basale remains intact. Therefore this layer is not shed and during secretory phase it causes the regeneration.', 'role': 'assistant'}]