Question: The sixth season of Game of Thrones will be most likely be adapted by David Benioff and D.B. Weiss from which George R.R. Martin book?
Sentence (from "Game of Thrones (season 5)"): The fifth season of the fantasy drama television series "Game of Thrones" premiered on HBO on April 12, and concluded on June 14, 2015.
Relevant evidence: No