Question: average distance between earth and moon in km
[{'answer': '400 000 km'}, {'provenance': [{'wikipedia_id': '899115', 'title': 'Lunar distance (astronomy)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 538, 'bleu_score': 0.8417668608256481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6695949051547713233}, 'section': 'Section::::Abstract.'}]}]