The drug pilocarpine is a muscarinic receptor agonist that binds to and activates acetylcholine receptors on the post-synaptic membranes of effector organs in the parasympathetic nervous system.

Which of the following clinical conditions could this drug be used to treat?

1. Xerostomia (abnormally dry mouth)
2. Non-obstructive urinary retention (inability to empty the bladder)
3. Bradycardia (abnormally slow heart rate)