instruction:
In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
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Passage: Tomic belonged to the first class of six Serbian pilots trained in France in 1912. In August 1914, he participated in the first aerial dogfight of the war, when he exchanged gunfire with an Austro-Hungarian plane over western Serbia. In the winter of 1915, during the Serbian Army's retreat across Albania to the Greek island of Corfu, he evacuated General Petar Bojovic from Scutari by plane, delivered mail by air and transported the Serbian Government's gold and hard currency reserves from Nis to keep them from falling into enemy hands. Following the occupation of Serbia by the Central Powers, Tomic went to France and flew over the Western Front, where he had one confirmed kill. He returned to the Balkans in late 1916, conducted combat missions over Bulgarian-occupied Macedonia and shot down one enemy plane. Tomic continued flying after the war and became head of the Royal Yugoslav Air Force's pursuit squadron in Novi Sad. During World War II, he was captured by the Germans and detained as a prisoner of war. Tomic left Yugoslavia following the war and settled in the United States with his wife. He died in Chicago in 1962.
Link Information: The Central Powers consisted of the German Empire and the Austro-Hungarian Empire at the beginning of the war. The Ottoman Empire joined the Central Powers later in 1914. In 1915, the Kingdom of Bulgaria joined the alliance. Question: How many nations were part of the powers that occupied Serbia?
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Answer: 4

question:
Passage: The Abana was sailing from Liverpool to Savannah, Georgia when she was caught in a storm in the Irish Sea. She was spotted at 3 pm drifting in a northwesterly direction with her sails torn to shreds. The crew mistook Blackpool Tower for a lighthouse and the ship was first spotted foundering at North Pier, and ended up drifting north and was wrecked off Little Bispham at 5 pm. Flares were fired and the lifeboat was called out. The alarm was raised by the landlord of the Cleveleys Hotel. Due to the weather conditions, the Blackpool lifeboat Samuel Fletcher had to be taken some overland to Bispham before it could be launched. The lifeboat had a crew of 16, and the Abana had a crew of 17, all of whom were taken on board along with the ship's dog, which belonged to Captain Danielson. The lifeboat grounded on a sandbank whilst returning to shore, but some of the crew members pushed the boat afloat and they managed to reach shore safely. All were taken to the Red Lion Inn to recover from their ordeal. The ship's bell and dog were given to the landlord of the Cleveleys Hotel, who had raised the alarm.
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Two Lancashire architects, James Maxwell and Charles Tuke, designed the tower and oversaw the laying of its foundation stone on 29 September 1891 Question: When was the structure the crew of the Abana mistook for a lighthouse constructed?
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Answer: 1891

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Passage: Jason La Canfora (born April 14, 1974) is an American sports writer and television analyst. He joined NFL Network and NFL.com before the 2009 season and served as an NFL insider and reporter until 2012. La Canfora appeared on NFL Total Access, NFL GameDay Morning, NFL GameDay Final, and Thursday Night Kickoff Presented by Sears. He also contributed stories and blogs to NFL.com. He replaced Adam Schefter, who left for ESPN. Before joining NFL Network, he worked ten years for The Washington Post and covered the Washington Redskins for six years. Prior to the Post, he was the Detroit Red Wings beat writer for the Detroit Free Press. On June 1, 2012, La Canfora announced via Twitter that he would be leaving NFL Network on July 1, 2012, after his contract expires for CBS Sports, replacing Charley Casserly on The NFL Today pregame show on Sundays. La Canfora currently resides in Baltimore, Maryland, with his wife Lauren and three children.
Link Information: none Question: How many years did La Canfora cover hockey?
answer:
Answer: none