Question: what type of ball is wilson in castaway
[{'answer': 'a Wilson volleyball', 'provenance': [{'wikipedia_id': '44501', 'title': 'Cast Away', 'start_paragraph_id': 5, 'start_character': 631, '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': 9496479579929745910}, 'section': 'Section::::Plot.\n'}]}]