Question: Mário Custódio Nazaré had a 15 day contract with the sports club based in what city?
Sentence (from "Beşiktaş J.K."): Beşiktaş Jimnastik Kulübü (] , English: Beşiktaş Gymnastics Club ), known as simply Beşiktaş (pronounced: "Beshiktash"), is a Turkish sports club founded in 1903, and based in the Beşiktaş district of Istanbul.
Relevant evidence: Yes