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'.
Example: Passage: The group was occasionally diverted from strategic missions to carry out air support and interdiction missions. It supported Operation Overlord, the invasion of Normandy by attacking transportation targets, including bridges, along with airfields and strong points in France. On D Day, the squadron and the rest of the 446th Group led the first heavy bomber mission of the day. The 446th aided ground forces at Caen and Saint-Lô during July by hitting bridges, gun batteries, and enemy troops. During Operation Market Garden, the attempt to seize a bridgehead across the Rhine in the Netherlands, the 704th dropped supplies to allied troops near Nijmegen. It struck lines of communications during the Battle of the Bulge. During Operation Varsity in March 1945, it supplied ground and airborne troops near Wesel. The squadron flew its last combat mission on 25 April 1945 against Salzburg, Austria. The group had flown 273 missions and had lost 58 aircraft during the war,
. Link Information: Operation Market Garden was a failed World War II military operation fought in the Netherlands from 17 to 25 September 1944. Question: When did the operation during which the 704th dropped supplies to allied troops near Nijmegen begin?
Example solution: from 17 to 25 September 1944
Example explanation: The passage describes the 704th's actions during Operation Market Garden, and the answer specifies when the operation happened.

Problem: Passage: Gottfried Graf von der Goltz (born 1 June 1964 in Würzburg, Germany) is a German violinist and conductor, specialising in the baroque repertoire. Born into the ancient Brandenburgish Goltz family, Gottfried was a great-grandson of the former commander of the Baltic Sea Division and the Baltische Landeswehr during WWI and the Russian Civil War General Rüdiger von der Goltz, his first teachers were his parents, Georg Conrad von der Goltz and Kirsti Hjort. After further education in Hannover, New York, and Freiburg, he joined the radio orchestra of Hamburg's Norddeutscher Rundfunk at the age of 21. Two years later he left in order to focus on his career as a soloist, chamber musician, and conductor. He is now musical leader of the Freiburger Barockorchester. From 1997 to 2004 he held a professorship with the Hochschule für Musik Würzburg. In October 2004 he was called to a professorship in violin and baroque violin at the Hochschule für Musik Freiburg. Since January 2007 von der Goltz has also been artistic director of the Oslo-based Norwegian Baroque Orchestra. His interests include salt-water swimming and gøbbing (exchanging ideas with members of a think tank). Gottfried von der Goltz's extensive discography and DVD production include recordings as soloist, chamber musician, and conductor, also of larger scenic works, like Rameau's Dardanus.
 Link Information: World War I (often abbreviated as WWI or WW1), also known as the First World War, the Great War, the Seminal Catastrophe, and initially in North America as the European War, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918.  Question: How old was von der Goltz' great-grandfather during WWI?

Solution: Answer: 50