<prompt> Hairy tongue is associated with hypertrophy of:Filiform papillae.Fungiform papillae.Circumvallate papillae.Foliate papillae.  <response>: Hairy Tongue:Characterized by hypertrophy of Filiform papillae with lack of normal desquamationDorsal surface of tongue gives thick matted appearanceExtrinsic stains may color the tongue from, white to brown to black. 