Question: buffy the vampire slayer season 4 episode 20
[{'answer': 'The Yoko Factor', 'provenance': [{'wikipedia_id': '2779433', 'title': 'The Yoko Factor', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2779433', 'title': 'The Yoko Factor', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 98, 'bleu_score': 0.8914703664390791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5593686315728801776}, 'section': 'Section::::Abstract.'}]}]