Select the incorrect statement from the following.

Buccopharyngeal respiration in frog:

The unpaired systemic branch is

Which of the following statements are correct with respect to $Frogs$?
$A$. $Bidder's$ canals are present in male $Frogs$
$B$. Copulatory pads are present in female $Frogs$
$C$. Sound producing vocal sacs are present in male $Frogs$
$D$. $Cloaca$ is present in male $Frog$ only
Choose the most appropriate answer from the options given below:

$A$ mature female frog lays how many ova at a time?

The $Y$-shaped bone is: