Given the task definition and input, reply with output. In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it. Your job is to determine which sentence(s) from the passage can be used to search for further information needed to answer the question.

Question: When was the building the Unknown Warrior's body was taken to built? Passage:At the quayside, Marshal Foch saluted the casket before it was carried up the gangway of the destroyer, , and piped aboard with an admiral's call. The Verdun slipped anchor just before noon and was joined by an escort of six battleships. As the flotilla carrying the casket closed on Dover Castle it received a 19-gun Field Marshal's salute. It was landed at Dover Marine Railway Station at the Western Docks on 10 November. The body of the Unknown Warrior was carried to London in South Eastern and Chatham Railway General Utility Van No.132, which had previously carried the bodies of Edith Cavell and Charles Fryatt. The van has been preserved by the Kent and East Sussex Railway. The train went to Victoria Station, where it arrived at platform 8 at 8.32pm that evening and remained overnight. ( marks the site: every year on 10 November, a small Remembrance service, organised by The Western Front Association, takes place between platforms 8 and 9.)
As the flotilla carrying the casket closed on Dover Castle it received a 19-gun Field Marshal's salute