Select the odd one out regarding the cells/layers associated with early embryonic development.

Observe the given figure carefully and identify the site of fertilization by considering the parts labeled as $a, b, c,$ and $d$.

Fraternal twins are produced when

Identify the $CORRECT$ match from the Columns $I$,$II$ and $III$.

$I$	$II$	$III$
$1$. Interstitial cells	$a$. Cortex of ovary	$i$. Follicular fluid
$2$. Sertoli cells	$b$. Ovarian follicle	$ii$. Progesterone
$3$. Granulosa cells	$c$. Testis	$iii$. Attachment of sperm bundle
$4$. Cells of corpus luteum	$d$. Seminiferous tubules	$iv$. Testosterone

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Endometrium is necessary for implantation of blastocyst.
Reason $R$: In the absence of fertilization,the corpus luteum degenerates that causes disintegration of endometrium.
In the light of the above statements,choose the correct answer from the options given below:

With reference to human beings,find out the mismatch pair.