Vaginal orifice, urethral orifice and clitoris are protected by

$A$ : 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.

The ducts which carry milk from mammary glands to nipple are called

The following diagram refers to the female reproductive system of human. Identify $A$ to $F$