Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.

[Q]: Three of the Galilean moons of Jupiter are Io, Europa and Callisto. Which is the fourth?
[A]: ganymede


[Q]: What is the capital of Iraq?
[A]: baghdad


[Q]: What is the edible sea snail of the genus Haliotis, which has an ear-shaped shell with a pearly interior?
[A]:
abalone