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.

[Q]: Category: MATH TERMS 
Clue: The term surd refers to irrational numbers like this number's square root, 1.7320508...
[A]: 3


[Q]: Category: 4-LETTER BANDS 
Clue: This duo had a 1984 No. 1 hit with "Wake Me Up Before You Go-Go"
[A]: wham!


[Q]: Category: AUTHORS 
Clue: This "Candide" author wrote the libretti for several Rameau operas, including "La Princesse de Navarre"
[A]:
voltaire