Question: what was given to perseus to make him invisible
[{'answer': 'the Cap of Invisibility', 'provenance': [{'wikipedia_id': '9537367', 'title': 'Cap of invisibility', 'start_paragraph_id': 1, 'start_character': 24, 'end_paragraph_id': 1, 'end_character': 47, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9537367', 'title': 'Cap of invisibility', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 533, 'bleu_score': 0.8603720521055581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1865751236442098286}, 'section': 'Section::::Abstract.'}]}]