Chorion is composed of

The amnion and chorion consist of which type of composition?

During pregnancy,the levels of which hormones are increased?

The first sign of a growing fetus can be noticed by:

Select the correct pairs of germ layers and their derivatives from the following; and choose the correct option given below.

Germ layer	Derivatives
$a$. Mesoderm	All types of muscles of body
$b$. Ectoderm	Iris Muscles and Ciliary Muscles
$c$. Endoderm	Lining of Middle ear
$d$. Ectoderm	Adrenal cortex and Medulla
$e$. Mesoderm	Sclera and Choroid layer of eye

The given figure shows the human foetus within the uterus with few structures marked as $A, B, C$ and $D$. Which of the following options shows the correct labeling?