Question: what time does afternoon end and evening start
[{'answer': 'about 6pm'}, {'provenance': [{'wikipedia_id': '1258972', 'title': 'Evening', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 683, 'bleu_score': 0.837071434736499, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4177930252073648728}, 'section': 'Section::::Abstract.'}]}]