This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Embryology 1, Subject name: Anatomy
Placenta develops from 
Select and explain. 
A. Decidua capsularis and Chorion frondosum, B. Decidua capsularis and Decidua basalis, C. Decidua basalis and Chorion frondosum, D. Decidua parietalis and Chorion frondosum
C: Decidua basalis and Chorion frondosum
Answer: C: Decidua basalis and Chorion frondosum 
Explanation: Development of placenta: - Placenta has two components : Maternal & Fetal When the blastocyst attaches to uterus in endometrium, the endometrium is called as decidua which is of three types: - Decidua basalis , Decidua capsularis & Decidua parietalis. Fetus will also have some chorionic membrane developing leading to villi formation : Chorion Frondosum & Chorion laeve. Chorion laeve will disappear. Chorionic Frondosum persists & contributes to placenta along with Decidua Basalis .