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.

Q: Passage: Dr. Radek Zelenka is a fictional character of a scientist in the television series Stargate Atlantis, portrayed by David Nykl. He is a member of the original expedition from Earth to the Ancient city of Atlantis in the Pegasus galaxy, which he joined after turning down a job at Masaryk University in his home country Czech Republic. His expertise on Ancient technology is only surpassed by Dr. Rodney McKay, with whom he shares a friendly rivalry. Zelenka's planned one-time appearance in the season 1 episode "Thirty-Eight Minutes" was followed by a recurring role for expository scenes with McKay and the leader of the expedition. Zelenka has since appeared in approximately half of each season's episodes and also appeared in the crossover episode "The Pegasus Project" of Stargate SG-1. The series finale of Atlantis, "Enemy at the Gate", marks his last appearance. For his portrayal of Radek Zelenka, David Nykl was nominated for a 2005 Leo Award in the category "Dramatic Series: Best Supporting Performance by a Male".
 Link Information: The show premiered on July 16, 2004; its final episode aired on January 9, 2009.  Answer: 2004

A: What years did the series run that included Dr. Radek Zelenka as a character?
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Q: Passage: In 2009 it was announced that the feature film Testament of Youth was in development by BBC Films and Heyday Films producer David Heyman, and was to be directed by James Kent. This had the support of the Vera Brittain Estate, Brittain's daughter Shirley Williams, and Brittain's biographer Mark Bostridge who is acting as consultant. Saoirse Ronan was cast to play Brittain in 2012 but was replaced in December 2013 when it was announced that Alicia Vikander would play Vera Brittain in the film which was released in late 2014 as part of the First World War commemorations. On 4 February 2014 Kit Harington joined the cast to play the role of Brittain's fiancé Roland Leighton. On 13 February 2014, Colin Morgan, Taron Egerton, and Alexandra Roach were announced to have joined the film's cast. An ensemble cast was later confirmed as filming began, including Dominic West, Emily Watson, Joanna Scanlan, Hayley Atwell, Jonathan Bailey and Anna Chancellor. It substituted Merton College, Oxford in the scenes showing Brittain's time as a student at Somerville College, arguing that filming in Somerville itself would been too difficult in light of the new buildings constructed there since the film's time period.
 Link Information: none Answer: none

A: Why was Saoirse Ronan replaced by Alicia Vikander?
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Q: Passage: Born on 25 June 1884 in South Kensington, England, the eldest child of Henry Neville Custance and Alice Georgina, née Custance. His grandfather was Admiral Sir Reginald Custance. He joined the Royal Navy on 15 January 1899 as a cadet. He was rated midshipman on 15 May 1900 and served aboard HMS Ocean. Promoted to sub-lieutenant on 15 July 1903 he served aboard HMS Foam in the Mediterranean Station between 1904–1905. He served upon HMS Venerable in 1905 and promoted to lieutenant on 15 January 1905. He was the Gunnery Officer aboard HMS Vanguard between 1913–1917, and was having dinner aboard another ship at Scapa Flow in 1917 when HMS Vanguard suffered an internal explosion and sank with the loss of lives of 843 men. He served aboard HMS Vanguard during World War I and was present during the battle of Jutland in 1916.
 Link Information: His grandfather was Admiral Answer: 37

A:
What is the age difference between Wilfred and his grandfather?
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