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'.

Ex Input:
Passage: Free-agent goaltender Jeff Hackett was signed from the Boston Bruins to replace Roman Cechmanek and challenge backup Robert Esche for the number one spot in 2003–04, but Hackett was forced to retire in February due to vertigo. During the course of the season, serious injuries suffered by both Jeremy Roenick (broken jaw) and Keith Primeau (concussion) in February forced the Flyers to trade for the Chicago Blackhawks' Alexei Zhamnov, who filled in well and kept the Flyers afloat. Esche entrenched himself as starter and remained in that position even after the Flyers re-acquired Sean Burke from the Phoenix Coyotes, as the Flyers clinched the Atlantic Division title over the New Jersey Devils on the last day of the season.
 Link Information: none Question: What are the symptoms of the condition that forced Hackett to retire?

Ex Output:
Answer: none


Ex Input:
Passage: Tomić 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 Bojović from Scutari by plane, delivered mail by air and transported the Serbian Government's gold and hard currency reserves from Niš to keep them from falling into enemy hands. Following the occupation of Serbia by the Central Powers, Tomić 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. Tomić 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. Tomić 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?

Ex Output:
Answer: 4


Ex Input:
Passage: Harris was born in Smithfield, Rhode Island in 1801 and at a young age moved with his parents to Dutchess County, New York where he worked on the family farm and taught school. In 1818 he moved to Ashtabula County, Ohio, but he returned to Rhode Island in 1823 and started working with his uncles William Harris and Samuel Harris in their manufacturing businesses at Valley Falls, Rhode Island and then Albion, Rhode Island. In 1831 Edward Harris started his own small mill in Woonsocket. He eventually built several other successful larger mills in Woonsocket. Harris made large donations to many public causes in Woonsocket, including new roads for the city, the land for Woonsocket High School, the site of Oak Hill Cemetery, and the Harris Institute (a library and auditorium for speakers), which became Woonsocket Harris Public Library, and the former Harris Institute building is now Woonsocket City Hall. Harris served in the Rhode Island State Senate and House of Representatives and was a strong abolitionist and temperance supporter. In the 1840s he ran for governor as the Liberty Party candidate advocating for abolitionism. In 1859 Harris wrote a letter and sent a check to John Brown after his conviction. Harris hosted Abraham Lincoln at his North End home when Lincoln spoke at the Harris Institute in 1860. Harris was married to Rachel Farnham and then after her death to Abby Metcalf and had children in both marriages. Harris died in Woonsocket in 1871. Besides the Harris Institute (Woonsocket City Hall), several of the buildings, which Harris constructed, survive, including Harris Warehouse (1855).
 Link Information: Abraham Lincoln (/ˈliŋkən/; February 12, 1809 – April 15, 1865) Question: How old was Abraham Lincoln the year that Harris hosted him at his North End home?

Ex Output:

Answer: 51