By the and of the second month of pregnancy the foetus develops........

$A$ : If fertilization occurs, the corpus luteum is rescued from regression by human chorionic gonadotropin, which is produced by placenta.
$R$ : In first trimester the corpus luteum stimulates by $hCG$ is responsible for the production of progesterone.

Choose incorrect pair :

The role of placenta is

In Human beings, at the end of $12$ weeks (first trimester) of pregnancy, the following is observed 

$A$ : Placenta is connected to the embryo through an umbilical cord which helps in the transport of substance to and from the embryo
$R$ : Placenta acts as an endocrine tissue