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 consistency, answers should be in all lower cased letters.

Q: Category: SUCH GOOD CHEMISTRY 
Clue: A U.S. nuclear weapon using this element, Co, has been termed a doomsday device, as it would wipe out life on Earth

A: cobalt
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Q: Category: THE THEATRE 
Clue: Playwright Jean Anouilh had a lot at "stake" with "L'Alouette", his play about this female saint

A: joan of arc
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Q: Category: BODIES OF WATER 
Clue: In the mid-1970s an oil pipeline was built between this Alaskan bay & the city of Valdez on Prince William Sound

A:
prudhoe bay
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