You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: LEGENDS 
Clue: The "Literature Lover's Book of Lists" says this engineer "blew his train whistle in a special way"

Answer: casey jones


Question: Category: NATURE 
Clue: Like a tree, you can tell the age of a fish by counting these on its scales

Answer: rings


Question: Category: BRITISH CHILDREN'S AUTHORS 
Clue: Richard Adams originally told this rabbit tale to amuse his young daughters

Answer:
watership down