Question: who is the american who plays for collingwood
[{'answer': 'Mason Cox', 'provenance': [{'wikipedia_id': '50313128', 'title': 'Mason Cox', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 9, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50313128', 'title': 'Mason Cox', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 490, 'bleu_score': 0.79124358521402, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16233619363376080255}, 'section': 'Section::::Abstract.'}]}]