Question: when did recreational pot become legal in california
[{'answer': 'November 2016', 'provenance': [{'wikipedia_id': '24473585', 'title': 'Cannabis in California', 'start_paragraph_id': 1, 'start_character': 448, 'end_paragraph_id': 1, 'end_character': 461, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]