Question: what kind of fuel do space rockets use
[{'answer': 'Rocket propellant', 'provenance': [{'wikipedia_id': '30873089', 'title': 'Rocket propellant', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]