Question: when did goku first go super saiyan 4
[{'answer': 'Dragon Ball GT', 'provenance': [{'wikipedia_id': '572605', 'title': 'Goku', 'start_paragraph_id': 2, 'start_character': 161, 'end_paragraph_id': 2, 'end_character': 175, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'During his epic battle with Frieza'}, {'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': 17553655830558116533}, 'section': 'Section::::Appearances.:In "Dragon Ball Z".\n'}]}, {'provenance': [{'wikipedia_id': '572605', 'title': 'Goku', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 563, 'bleu_score': 0.926627575090266, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17553655830558116533}, 'section': 'Section::::Conception and creation.\n'}]}, {'provenance': [{'wikipedia_id': '572605', 'title': 'Goku', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17553655830558116533}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '572605', 'title': 'Goku', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['As the protagonist, Goku appears in most of the episodes, films, television specials and OVAs of the manga\'s anime adaptations ("Dragon Ball", "Dragon Ball Z", "Dragon Ball GT", "Dragon Ball Super" and "Dragon Ball Heroes") as well as many of the franchise\'s video games. Due to the series\' international popularity, Goku has become one of the most recognizable and iconic characters in the world. Outside the "Dragon Ball" franchise, Goku has made cameo appearances in Toriyama\'s self-parody series "Neko Majin Z", has been the subject of other parodies, and has appeared in special events. Most Western audiences were introduced to the adult version of Goku appearing in the "Dragon Ball Z" anime, itself an adaptation of "Dragon Ball" manga volumes 17-42, as opposed to his initial child form, due to the limited success of the first series overseas. Goku\'s critical reception has been largely positive and he is often considered to be one of the greatest manga and anime characters of all time', 'Goku appears in most of the episodes, films, television specials and OVAs of the manga\'s anime adaptations ("Dragon Ball", "Dragon Ball Z", "Dragon Ball GT",', 'As the protagonist, Goku appears in most of the episodes, films, television specials and OVAs of the manga\'s anime adaptations ("Dragon Ball", "Dragon Ball Z", "Dragon Ball GT", "Dragon Ball Super" and "Dragon Ball Heroes") as well as many of the franchise\'s video games.']}}]}]