Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Q: Context: Comet ISON, formally known as C/2012 S1, was a sungrazing comet discovered on 21 September 2012 by Vitali Nevski ( , Vitebsk, Belarus) and Artyom Novichonok ( , Kondopoga, Russia). 
 Question: By whom was Comet ISON discovered?

A: artyom novichonok
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Q: Context: Ceraunius Tholus is a volcano on Mars located in the Tharsis quadrangle at 24.25 north latitude and 262.75 east longitude, part of the Uranius group of volcanoes. 
 Question: On what moon or planet can Ceraunius Tholus be found?

A: mars
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Q: Context: The Noleby Runestone is now located in the Swedish Museum of National Antiquities in Stockholm. 
 Question: What is the name of the place where Noleby Runestone can be found?

A:
swedish museum of national antiquities
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