What is the Mullerian duct?

The following diagram shows a section of the female reproductive system. What are $P, Q,$ and $R$?
$\quad\quad\quad P \quad\quad Q \quad\quad R$

Which female gland is homologous to the prostate gland in males?

Which of the following is the correct match regarding the female external genitalia and their functions?

Identify the correct label from the given diagram of the female reproductive system.

$A$ : Presence or absence of hymen is not a reliable indicator of virginity or sexual experience.
$R$ : It can be broken down by a sudden fall or jolt,insertion of a vaginal tampon,or active participation in some sports like horse riding.