Question: in the movie castaway what kind of ball was wilson
[{'answer': 'volleyball', 'provenance': [{'wikipedia_id': '44501', 'title': 'Cast Away', 'start_paragraph_id': 5, 'start_character': 640, 'end_paragraph_id': 5, 'end_character': 650, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '44501', 'title': 'Cast Away', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 947, 'bleu_score': 0.8595807585314951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11736059828713290403}, 'section': 'Section::::Plot.\n'}]}]