$A$ : 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.
Assertion and Reason both are correct and also correct explantion.
Assertion and Reason both are correct but not explanation of assertion.
Assertion is correct, but Reason is incorrect.
Both Assertion and Reason are incorrect.
The given figure shows the human foetus within the uterus with few structures marked as $A,\,B,\,C$ and $D$.
Which of the following options shows the correct labeling ?
Mammalian placenta has minute finger like projections called
All of the following statements concerning pregnancy are accurate $EXCEPT$
Choose incorrect pair :
Which of the following organ is differentiated first during development ?