Question: what is saturn's moon titan made of
[{'answer': 'water ice and rocky material', 'provenance': [{'wikipedia_id': '47402', 'title': 'Titan (moon)', 'start_paragraph_id': 3, 'start_character': 28, 'end_paragraph_id': 3, 'end_character': 53, 'bleu_score': 0.668740304976422, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47402', 'title': 'Titan (moon)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 461, 'bleu_score': 0.8585850258763431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 741063710715575206}, 'section': 'Section::::Abstract.'}]}]