$B - $Cortex
$C - $Renal column
$D - $Ureter
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$(i)$ Over secretion of growth hormone $(ii)$ Under secretion of growth hormone
$(iii)$ Over secretion of somatostatin $(iv)$ Under secretion of somatostatin
$R$ - Lactobacillus is a fungi.
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: