Question: when was the first episode of top gear aired
[{'answer': 'April 1977', 'provenance': [{'wikipedia_id': '6262423', 'title': 'Top Gear (1977 TV series)', 'start_paragraph_id': 1, 'start_character': 35, 'end_paragraph_id': 1, 'end_character': 45, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6262423', 'title': 'Top Gear (1977 TV series)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 247, 'bleu_score': 0.958740481558872, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14506191835465102532}, 'section': 'Section::::Abstract.'}]}]