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: GOVERNMENT AGENCIES 
Clue: The Centers for Disease Control & Prevention is an agency of this department
health and human services

Category: INSECTS 
Clue: This snout beetle reached Texas from Mexico around 1890 & spread into most cotton-growing areas of the U.S.
the boll weevil

Category: EASTERN EUROPE 
Clue: In November 1989 hard liner Todor Zhivkov resigned after leading this country for 35 years

bulgaria