Question: who did robert de niro play in godfather 2
[{'answer': 'Vito Corleone', 'provenance': [{'wikipedia_id': '73875', 'title': 'The Godfather Part II', 'start_paragraph_id': 1, 'start_character': 542, 'end_paragraph_id': 1, 'end_character': 555, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '73875', 'title': 'The Godfather Part II', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 660, 'bleu_score': 0.937424818699032, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11336228493633477536}, 'section': 'Section::::Abstract.'}]}]