Question: who was the first saiyan to fight goku
[{'answer': 'Vegeta', 'provenance': [{'wikipedia_id': '572605', 'title': 'Goku', 'start_paragraph_id': 10, 'start_character': 214, 'end_paragraph_id': 10, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Conception and creation.:Design.\n'}]}, {'provenance': [{'wikipedia_id': '572605', 'title': 'Goku', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 859, 'bleu_score': 0.5754202684712091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5879881369181353582}, 'section': 'Section::::Appearances.:In "Dragon Ball Z".\n'}]}]