TASK DEFINITION: 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 consistency, answers should be in all lower cased letters.
PROBLEM: Category: BOTANY
Clue: Cryptogams are not plants with secret meanings, but plants such as ferns that don't bear these

SOLUTION: seeds

PROBLEM: Category: E BEFORE I
Clue: Hold your horses! & to make it easier, use these straps that attach to the bit of the bridle

SOLUTION: reins

PROBLEM: Category: "LAST" CHANCE
Clue: The last 3 words of Martin Luther King Jr.'s "I Have a Dream" speech, they also appear in his epitaph

SOLUTION:
"free at last"