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: GEOGRAPHY 
Clue: This Sudanese capital is located at the junction of the Blue & the White Nile
khartoum

Category: GENERAL ED. 
Clue: A zygote is produced by the union of 2 of these sex cells, an egg & a sperm
gametes

Category: WHO DIED & MADE YOU KING? 
Clue: Tigranes III of Armenia (Don't overthink this one)

tigranes iv