Which of the following medications stimulates salivation rather than causing xerostomia?

Pilocarpine is a parasympathomimetic (muscarinic agonist) that stimulates M3 receptors on salivary gland acinar cells, increasing salivary secretion. It is used clinically to treat xerostomia in patients with Sjogren syndrome and radiation-induced salivary gland damage. Scopolamine is an anticholinergic that reduces secretions (used to prevent motion sickness). Amitriptyline is a tricyclic antidepressant with strong anticholinergic properties that causes significant xerostomia. Hydrochlorothiazide (a diuretic) decreases body fluids and can reduce salivary flow.