Thanks, exactly. But that would make the use of "qual" (which was marked as wrong) even more appropriate in this case.
citing from the discussion: "Qual é o teu carro - which is your car, from all available models, or from two available parked cars."
"Qual papel você quer?" - from all available roles of the play, or from two still available roles to choose from.
Even if I am talking to the buying agent of a printers shop: "Qual (tipo de) papel você quer?" Which paper do you want (from all the types my papermill is producing).