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: WINSTON CHURCHILL 
Clue: Churchill turned down a dukedom but did accept a knighthood from this monarch in 1953
queen elizabeth ii

Category: MEDICINE 
Clue: Robert Koch, in 1876, was the first to identify the bacterium causing a specific disease, this disease of cattle & man
anthrax

Category: QUEEN 
Clue: This ancient queen seduced 2 Roman generals, hastening their demise, & also had her own sister Arsinoe killed

cleopatra