This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Placenta and Chorion Development, Subject name: Gynaecology & Obstetrics
Mature placenta on fetal side is covered by: 
Select and explain. 
A. Amnion, B. Chorion, C. Decidua, D. Amniotic membrane
A: Amnion
Answer: A: Amnion 
Explanation: Ans. (a) AmnionRef: D.C. Dutta 8th ed. / 34-35, 7th ed./ 29Maternal surface of placenta covered by remnant of the deciduas basalis (compact and spongy layer)Fetal surfaceMaternal surfaceSmooth, glisteningRough, spongyCovered by amnion (above) and chorion (below)Covered by remnant of deciduas basalisUmbilical cord is attachedHas 15-20 lobes/ cotyledons4/5 of placenta is fetal origin1/5 is maternal origin