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.
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Question: Which semi-aquatic carnivorous mammals belong to the genus `Lutra'?

Answer: otter


Question: What is the name of the tiger in the 2001 novel 'Life of Pi'?

Answer: richard parker


Question: Directed by Joss Whedon, which 2005 science fiction movie was based on a short-lived TV show that was cancelled after only eleven of its episodes were broadcast?

Answer:
serenity