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: ON THE GO 
Clue: John Ericsson, who built a steam locomotive in England in 1829, built this famous Civil War steam-powered ship

Answer: the monitor


Question: Category: SONGS 
Clue: The title song in an Elvis film, it was written for the 1937 Bing Crosby film "Waikiki Wedding"

Answer: blue hawaii


Question: Category: LATIN LEGAL TERMS 
Clue: You don't adopt a child but assume obligations incident to the natural parent relationship "in" this phrase

Answer:
in loco parentis