Question: who plays gamora in guardians of the galaxy vol 2
[{'answer': 'Zoe Saldana', 'provenance': [{'wikipedia_id': '43402974', 'title': 'Guardians of the Galaxy Vol. 2', 'start_paragraph_id': 1, 'start_character': 422, 'end_paragraph_id': 1, 'end_character': 433, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43402974', 'title': 'Guardians of the Galaxy Vol. 2', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 665, 'bleu_score': 0.9823771291847391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16409982259545872632}, 'section': 'Section::::Cast.\n'}]}]