Choose the $CORRECT$ group of labelling.

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

Foetal sex can be determined by examining cells from amniotic fluid by looking for:

After one month of pregnancy,the embryo's $A$ is formed. By the end of the $B$ month of pregnancy,the foetus develops limbs and digits. By the end of $C$,most of the major organ systems are formed,for example,the limbs and external genital organs are well-developed. By the end of $D$,the body is covered with fine hair,eyelids separate,and eyelashes are formed. Here $A$ and $D$ refer to:

The period of pregnancy is called:

Which of the following cannot pass through the placenta into the foetus?