Question: who is the most spoken language in the world
[{'answer': 'Mandarin', 'provenance': [{'wikipedia_id': '405385', 'title': 'List of languages by number of native speakers', 'start_paragraph_id': 7, 'start_character': 70, 'end_paragraph_id': 7, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]