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.

Category: IN THE DICTIONARY 
Clue: In his dictionary, Samuel Johnson self-effacingly defined this job title in part as "a harmless drudge"
lexicographer

Category: PLAGUES & PESTILENCE 
Clue: Having first escaped from a South American research lab in 1957, they became a threat to the U.S. in 1990
killer bees

Category: ORGANIZATIONS 
Clue: It moved its HQ from Savannah to Wash. D.C. in 1913, & in 1917 began making each First Lady honorary pres.

the girl scouts of the u.s.a.