Question: where is a worm and wheel gear used
[{'answer': 'gearbox', 'provenance': [{'wikipedia_id': '2681493', 'title': 'Worm drive', 'start_paragraph_id': 5, 'start_character': 2, 'end_paragraph_id': 5, 'end_character': 9, 'bleu_score': 1.0, 'section': 'Section::::Explanation.\n'}]}]