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 simplicity, answers should be in all lower cased letters.
PROBLEM: Category: THERE'S A WEIGHT 
Clue: At the Kentucky Derby, the horses' equipment & these can weigh no less than 126 lbs. combined

SOLUTION: the weight of the jockey

PROBLEM: Category: SITCOM NEIGHBORS 
Clue: Nosy neighbor Gladys Kravitz

SOLUTION: bewitched

PROBLEM: Category: RED ROVER, RED ROVER 
Clue: This NASA "Lab" based in Pasadena designed the rovers used on Mars

SOLUTION:
jpl