Spermiogenesis or spermatiliosis is

When both $LH$ and $FSH$ attain peak level in the menstrual cycle ?

Placenta acts as an endocrine tissue and produces several hormones like

$A.$ Human chorionic gonadotropin $(hCG)$
$B.$ Human placental lactogen $(hPL)$
$C.$ Estrogens
$D.$ Progesterone

The extra embryonic membranes of the mammalian embryo are derived from

$A$ : Lack of menstruation may be indicative of pregnancy.
$R$ : Menstruation only occurs if the released ovum is fertilised.