Question: what's the name of c3-po's robot companion in star wars
[{'answer': 'R2 - D2'}, {'provenance': [{'wikipedia_id': '63170', 'title': 'C-3PO', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 696, 'bleu_score': 0.7317224102359561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7270794608983382726}, 'section': 'Section::::Abstract.'}]}]