Problem: Given the question: Extract the answer to the question from the following context. Question: what is the lack of a precipitation-generating mechanism responsible for creating a shortage of? Context: The primary source of rain in the Sahara is the equatorial low a continuous belt of low-pressure systems near the equator which bring the brief, short and irregular rainy season to the Sahel and the southern Sahara. The Sahara doesn't lack precipitation because of a lack of moisture, but due to the lack of a precipitation-generating mechanism. Rainfall in this giant desert has to overcome the physical and atmospheric barriers that normally prevent the production of precipitation. The harsh climate of the Sahara is characterized by extremely low, unreliable, highly erratic rainfall; extremely high sunshine duration values; high temperatures year-round; negligible rates of relative humidity, a significant diurnal temperature variation and extremely high levels of potential evaporation which are the highest recorded worldwide.
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The answer is:
precipitation


Problem: Given the question: Extract the answer to the question from the following context. Question: Who sings Radio Ga Ga? Context: Queen composed music that drew inspiration from many different genres of music, often with a tongue-in-cheek attitude. The genres they have been associated with include progressive rock, symphonic rock, art rock, glam rock, hard rock, heavy metal, pop rock, and psychedelic rock. Queen also wrote songs that were inspired by diverse musical styles which are not typically associated with rock groups, such as opera, music hall, folk music, gospel, ragtime, and dance/disco. Several Queen songs were written with audience participation in mind, such as "We Will Rock You" and "We Are the Champions". Similarly, "Radio Ga Ga" became a live favourite because it would have "crowds clapping like they were at a Nuremberg rally".
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The answer is:
Queen


Problem: Given the question: Extract the answer to the question from the following context. Question: How many miles is equivalent to 594 nautical miles? Context: Bermuda is a group of low-forming volcanoes located in the Atlantic Ocean, near the western edge of the Sargasso Sea, roughly 578 nautical miles (1,070 km (665 mi)) east-southeast of Cape Hatteras on the Outer Banks of North Carolina and about 594 nautical miles (1,100 km (684 mi)) southeast of Martha's Vineyard of Massachusetts. It is 898 nautical miles (1,664 km (1,034 mi)) northeast of Miami, Florida, and 667 nautical miles (1,236 km (768 mi)) from Cape Sable Island, in Nova Scotia, Canada. The islands lie due east of Fripp Island, South Carolina, west of Portugal and north of Puerto Rico.
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The answer is:
684