instruction:
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.
question:
Category: INVENTIONS 
Clue: 11-year-old Frank Epperson invented this by accident when his fruit drink froze after being left outside overnight
answer:
the popsicle


question:
Category: FRENCH NOVELISTS 
Clue: Ideas in his novels that have come true include space travel, television & the submarine
answer:
jules verne


question:
Category: SPORTS SUPERLATIVES 
Clue: This oldest tennis player ever to win a Grand Slam title did so at the Australian Open mixed doubles in 2003
answer:

martina navratilova