Question: when did the oil embargo of 1973 end
[{'answer': 'March 1974', 'provenance': [{'wikipedia_id': '244180', 'title': '1973 oil crisis', 'start_paragraph_id': 2, 'start_character': 29, 'end_paragraph_id': 2, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]