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

Category: EPITAPHS 
Clue: "Subject of the decision of the Supreme Court of the United States in 1857 which denied citizenship to the Negro"
dred scott

Category: THE KINGS OF ENGLAND 
Clue: 2 years after becoming king in 1413, Henry V declared war on this country

france