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: The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source. Luminous flux differs from power (radiant flux) in that radiant flux includes all electromagnetic waves emitted, while luminous flux is weighted according to a model (a 'luminosity function') of the human eye's sensitivity to various wavelengths. Lumens are related to lux in that one lux is one lumen per square meter.

A: what is the difference between lux and lumens
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Q: The Withlacoochee River (or Crooked River) originates in central Florida's Green Swamp, east of Polk City. It flows west, then north, and then turns northwest and finally west again before it empties into the Gulf of Mexico near Yankeetown. The river is 141 miles (227 km) long and has a drainage basin of 1,170 square miles (3,000 km). It is believed to have been named after the Withlacoochee River to the north.

A: where does the withlacoochee river begin and end
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Q: When hoisting a flag that is to be displayed at half-mast, it should be raised to the finial of the pole for an instant, then lowered to half-mast. Likewise, when the flag is lowered at the end of the day, it should be hoisted to the finial for an instant, and then lowered.

A:
how do you fly the flag at half mast
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