In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

[Q]: A muzzle brake or recoil compensator is a device connected to the muzzle of a firearm or cannon that redirects propellant gases to counter recoil and unwanted rising of the barrel. The concept was first introduced for artillery and was a common feature on many anti-tank guns, especially those mounted on tanks, in order to reduce the area needed to take up the strokes of recoil and kickback. They have been used in various forms for rifles and pistols to help control recoil and the rising of the barrel that normally occurs after firing. They are used on pistols for practical pistol competitions, and are usually called compensators in this context.
[A]: what does a compensator do for a gun


[Q]: The perihelion (/ ˌpɛrɪˈhiːliən /) of any orbit of a celestial body about the Sun is the point where the body comes nearest to the Sun. It is the opposite of aphelion (/ æpˈhiːliən /), which is the point in the orbit where the celestial body is farthest from the Sun.
[A]: what does the term perihelion and aphelion mean


[Q]: Los Angeles County, officially the County of Los Angeles, (Spanish: Condado de Los Ángeles) is the most populous county in the United States, with more than 10 million inhabitants as of 2017. Its population is larger than that of 41 individual U.S. states. It is the third-largest metropolitan economy in the world, with a Nominal GDP of over $700 billion -- larger than the GDPs of Belgium, Saudi Arabia, Norway and Taiwan. It has 88 incorporated cities and many unincorporated areas and at 4,083 square miles (10,570 km), it is larger than the combined areas of Delaware and Rhode Island. The county is home to more than one-quarter of California residents and is one of the most ethnically diverse counties in the U.S. Its county seat, Los Angeles, is also its most populous city at about four million.
[A]:
what is the difference between los angeles and los angeles county