Question: where does the thrust come from on a jet engine
[{'answer': 'internal combustion'}, {'provenance': [{'wikipedia_id': '15944', 'title': 'Jet engine', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 784, 'bleu_score': 0.7654868040081221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8627684169627494648}, 'section': 'Section::::Abstract.'}]}]