Question: who is the actor who plays jake sully in avatar
[{'answer': 'Samuel Henry John Worthington', 'provenance': [{'wikipedia_id': '2964059', 'title': 'Sam Worthington', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2964059', 'title': 'Sam Worthington', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 453, 'bleu_score': 0.6693036633332371, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2697983726824883569}, 'section': 'Section::::Abstract.'}]}]