Question: In 2015 Ramon Tebar was named  Principal Guest Conductor of an opera house located in what city?
Sentence (from "Palau de les Arts Reina Sofia"): Palau de les Arts Reina Sofia (] ; Spanish: "Palacio de las Artes Reina Sofía" ; anglicised as "Reina (Queen) Sofía Palace of the Arts") is an opera house and cultural centre in Valencia, Spain.
Relevant evidence: Yes