Task: Question Answering
Input (English): Passage: On October 6, 1970, on holiday in Istanbul, Turkey, American college student Billy Hayes straps 2 kg of hashish blocks to his chest. While attempting to board a plane back to the United States with his girlfriend, Billy is arrested by Turkish police on high alert for fear of terrorist attacks. He is strip-searched, photographed, and questioned.
After a while, a shadowy American, who is never named but is nicknamed "Tex" by Billy for his thick Texan accent, arrives, takes Billy to a police station, and translates Billy's English for one of the detectives. Billy says that he bought the hashish from a taxicab driver and offers to help the police track him down in exchange for his release. Billy goes with the police to a nearby market and points out the cab driver, but when they go to arrest the cabbie, it becomes apparent that the police have no intention of keeping their end of the deal with Billy. He sees an opportunity and makes a run for it, only to get cornered and recaptured by the mysterious American.
During his first night in holding at a local jail, a freezing-cold Billy sneaks out of his cell and steals a blanket. Later that night, he is rousted from his cell and brutally beaten by chief guard Hamidou for the theft.
He wakes a few days later in Sağmalcılar Prison, surrounded by fellow Western prisoners Jimmy (an American who is in for stealing two candlesticks from a mosque), Max (an English heroin addict), and Erich (a Swede, also in for drug smuggling), who help him to his feet. Jimmy tells Billy that the prison is a dangerous place for foreigners like them and that no one can be trusted, even young children. 
Question: Who gives the nickname to the man with the thick accent?
Output (English): Billy.