Question: when did the water crisis start in california
[{'answer': 'December 2011', 'provenance': [{'wikipedia_id': '53091227', 'title': '2011–2017 California drought', 'start_paragraph_id': 1, 'start_character': 77, 'end_paragraph_id': 1, 'end_character': 90, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]