Question: who played thanos in gardians of the galaxy
[{'answer': 'Josh Brolin', 'provenance': [{'wikipedia_id': '36450985', 'title': 'Guardians of the Galaxy (film)', 'start_paragraph_id': 25, 'start_character': 14, 'end_paragraph_id': 25, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'provenance': [{'wikipedia_id': '36450985', 'title': 'Guardians of the Galaxy (film)', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 1321, 'bleu_score': 0.9795519354525231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12782202884198831973}, 'section': 'Section::::Cast.\n'}]}]