In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
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Question: Passage: The Duchy of Prussia was a duchy in the eastern part of Prussia from 15251701. In 1525 during the Protestant Reformation, the Grand Master of the Teutonic Knights, Albert of Hohenzollern, secularized the Prussian State of the Teutonic Order, becoming Albert, Duke in Prussia. His duchy, which had its capital in Konigsberg (Kaliningrad), was established as a fief of the Crown of Poland, as had been Teutonic Prussia since the Second Peace of Thorn in October 1466. This treaty had ended the War of the Cities or Thirteen Years' War and provided for the Order's cession of its rights over the western half of its territories to the Polish crown, which became the province of Royal Prussia, while the remaining part of the Order's land became a fief of the Kingdom of Poland (13851569). In the 17th century King John II Casimir of Poland submitted Frederick William to regain Prussian suzerainty in return for supporting Poland against Sweden. On July 29, 1657, they signed the Treaty of Wehlau in Wehlau (Polish: Welawa; now Znamensk), whereby Frederick William renounced a previous Swedish-Prussian alliance and John Casimir recognised Frederick William's full sovereignty over the Duchy of Prussia. Full sovereignty was a necessary prerequisite for upgrading the Duchy to Kingdom of Prussia in 1701.
Link Information: This treaty had ended the War of the Cities or Thirteen Years' War and provided for the Order's cession of its rights over the western half of its territories to the Polish crown, which became the province of Royal Prussia Answer: Thirteen Years

Answer: How long did the war that ended with the Teutonic Order conceding territorial rights to the Polish crown last?

Question: Passage: Jenny Morris was born in Tokoroa, New Zealand and grew up in Hamilton with three brothers (Alistair, Rhys and Tam) and four sisters (Maxine, Bronte, Joanne and Shanley). Morris wrote a poem on the Vietnam War when she was 12 and used her sister's guitar to put it to music. Morris has stated that her influences include Aretha Franklin and Dusty Springfield. Her first professional performance was at age fifteen, at Andersons Theatre Restaurant, in Hamilton. In 1976 she became a singer with How's Your Father, who were finalists in the 'National Battle of the Bands'. She began working as a Home Economics teacher for two years at a high school near Wellington. Late in 1978 Morris joined an all-girl group, Wide Mouthed Frogs in Wellington, performing lead vocals. Fellow members were Kate Brockie on lead vocals, Andrea Gilkison on guitar, Tina Matthews on bass guitar, Bronwyn Murray on keyboards and Sally Zwartz on drums. In 1979 they released the track, "Some Day" for the compilation album, Home Grown Volume One; "Some Day" was cowritten with Tony Backhouse, guitarist of fellow Wellington band, The Spats, which also had a track, "Young Ladies in Hot Cars", on the compilation.
Link Information: none Answer: none

Answer: Which one of Morris's stated influences had more career album sales by the year that she joined an all-girl group called Wide Mouthed Frogs?

Question: Passage: Stren studied at Lillehammer Latin- og Realskole, at Qvams skole in Christiania and at the Swiss Federal Institute of Technology Zurich from 1862 to 1865. In 1866 he started working as a draftsman for Kanalvsenet, the body for exploitation of Norwegian water resources, and held various positions at Kanalvsenet over a period of 41 years. He ended his career as manager for the Bandak-Norsj Canal from 1891 to 1907. The boat locks of the Bandak-Norsj Canal could lift boats with a length of up to 100 feet. The canal became an important water transport system, and also a tourist destination. Stren was a counsellor for industrialist Sam Eyde, the founder and first mangager of Norsk Hydro, who acquired rights for exploiting waterfalls for hydroelectric power. Stren published maps and overviews of water resources in Norway, such as his map from 1904. He was the first editor of the magazine Norsk Teknisk Tidsskrift, which he edited from 1883 to 1886. He was also a proponent for the construction of the Holmenkoll Line, and chaired the board of directors for ten years from 1896. He was decorated Knight of the Royal Norwegian Order of St. Olav in 1893.
Link Information: He was the founder of both Norsk Hydro and Elkem. Answer: Norsk Hydro

Answer:
What companies were owned or founded by the industrialist that Stren was a counsllor for?