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.

Ex Input:
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.

Ex Output:
what does a compensator do for a gun


Ex Input:
The Ghost Dance (Caddo: Nanissáanah, also called the Ghost Dance of 1890) was a new religious movement incorporated into numerous American Indian belief systems. According to the teachings of the Northern Paiute spiritual leader Wovoka (renamed Jack Wilson), proper practice of the dance would reunite the living with spirits of the dead, bring the spirits of the dead to fight on their behalf, make the white colonists leave, and bring peace, prosperity, and unity to Native American peoples throughout the region.

Ex Output:
why did the plains tribes began performing the ghost dance in 1889


Ex Input:
The LVDT converts a position or linear displacement from a mechanical reference (zero, or null position) into a proportional electrical signal containing phase (for direction) and amplitude (for distance) information. The LVDT operation does not require an electrical contact between the moving part (probe or core assembly) and the coil assembly, but instead relies on electromagnetic coupling.

Ex Output:

when do you obtain null position in lvdt


