You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: FICTIONAL CHARACTERS 
Clue: Lassiter is the gun-slinging hero of this Zane Grey novel & appears in its sequel "The Rainbow Trail"
"riders of the purple sage"

Category: OIL PAINTING 
Clue: This painting surface may be linen or cotton & is placed on a frame called a stretcher
canvas

Category: PUT IT ON PAPER 
Clue: On Dec. 10, 1948 the U.N. General Assembly adopted it & called upon nations to display & disseminate it

the declaration of human rights