instruction:
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.
question:
Context: Amazonis Planitia is one of the smoothest plains on Mars. 
 Question: On what celestial body is Amazonis Planitia located?
answer:
mars


question:
Context: Castigliano's method, named for Carlo Alberto Castigliano, is a method for determining the displacements of a linear-elastic system based on the partial derivatives of the energy. 
 Question: Who was the original discoverer of Castigliano's method?
answer:
carlo alberto castigliano


question:
Context: HD 113538 (Gliese 496.1) is a K-type main-sequence star of a late spectral type (K9V) that lies approximately 51 light-years away in the constellation of Centaurus. 
 Question: What is the name of the constellation where HD 113538 belongs?
answer:

centaurus