Task: Question Answering
Input (English): Passage: In the final two weeks before the test, some 250 personnel from Los Alamos were at work at the Trinity site, and Lieutenant Bush's command had ballooned to 125 men guarding and maintaining the base camp. Another 160 men under Major T.O. Palmer were stationed outside the area with vehicles to evacuate the civilian population in the surrounding region should that prove necessary. They had enough vehicles to move 450 people to safety, and had food and supplies to last them for two days. Arrangements were made for Alamogordo Army Air Field to provide accommodation. Groves had warned the Governor of New Mexico, John J. Dempsey, that martial law might have to be declared in the southwestern part of the state.Shelters were established 10,000 yards (9,100 m) due north, west and south of the tower, known as N-10,000, W-10,000 and S-10,000. Each had its own shelter chief: Robert Wilson at N-10,000, John Manley at W-10,000 and Frank Oppenheimer at S-10,000. Many other observers were around 20 miles (32 km) away, and some others were scattered at different distances, some in more informal situations. Richard Feynman claimed to be the only person to see the explosion without the goggles provided, relying on a truck windshield to screen out harmful ultraviolet wavelengths.Bainbridge asked Groves to keep his VIP list down to just ten. He chose himself, Oppenheimer, Richard Tolman, Vannevar Bush, James Conant, Brigadier General Thomas F. Farrell, Charles Lauritsen, Isidor Isaac Rabi, Sir Geoffrey Taylor, and Sir James Chadwick. The VIPs viewed the test from Compania Hill, about 20 miles (32 km) northwest of the tower. The observers set up a betting pool on the results of the test. Edward Teller was the most optimistic, predicting 45 kilotons of TNT (190 TJ). He wore gloves to protect his hands, and sunglasses underneath the welding goggles that the government had supplied everyone with. Teller was also one of the few scientists to actually watch the test (with eye protection), instead of following orders to lie on the ground with his back turned. He also brought suntan lotion, which he shared with the others. 
Question: What is the last name of the person who brought suntan lotion?
Output (English): Teller.