In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

[EX Q]: What is sometimes combined with an RPG tube to keep from harming the user?, Context: Rocket-propelled grenades can be—and often are—used against hovering helicopters (e.g., by Somali militiamen during the Battle of Mogadishu (1993)). Firing an RPG at steep angles poses a danger to the user, because the backblast from firing reflects off the ground. In Somalia, militia members sometimes welded a steel plate in the exhaust end of an RPG's tube to deflect pressure away from the shooter when shooting up at US helicopters. RPGs are used in this role only when more effective weapons are not available.
[EX A]: a steel plate in the exhaust end

[EX Q]: Who is married to Kim?, Context: In September 2010, West wrote a series of apologetic tweets addressed to Swift including "Beyonce didn't need that. MTV didn't need that and Taylor and her family friends and fans definitely didn't want or need that" and concluding with "I'm sorry Taylor." He also revealed he had written a song for Swift and if she did not accept the song, he would perform it himself. However, on November 8, 2010, in an interview with a Minnesota radio station, he seemed to recant his past apologies by attempting to describe the act at the 2009 awards show as "selfless" and downgrade the perception of disrespect it created. In "Famous," a track from his 2016 album The Life of Pablo, West implies that this incident led to Swift's stardom, rapping, "I feel like me and Taylor might still have sex/ Why? I made that bitch famous." After some media backlash about the reference, West posted on Twitter "I did not diss Taylor Swift and I've never dissed her...First thing is I'm an artist and as an artist I will express how I feel with no censorship." He continued by adding that he had asked both Swift and his wife, Kim Kardashian, for permission to publish the line.
[EX A]: West

[EX Q]: What was Louis Agassiz's theory about the ice covering the Alps?, Context: In the Miocene Epoch the mountains underwent severe erosion because of glaciation, which was noted in the mid-19th century by naturalist Louis Agassiz who presented a paper proclaiming the Alps were covered in ice at various intervals—a theory he formed when studying rocks near his Neuchâtel home which he believed originated to the west in the Bernese Oberland. Because of his work he came to be known as the "father of the ice-age concept" although other naturalists before him put forth similar ideas.
[EX A]:
various intervals