Question: what is the most common dialect of chinese
[{'answer': 'Mandarin', 'provenance': [{'wikipedia_id': '253645', 'title': 'Varieties of Chinese', 'start_paragraph_id': 1, 'start_character': 388, 'end_paragraph_id': 1, 'end_character': 396, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '253645', 'title': 'Varieties of Chinese', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 511, 'bleu_score': 0.611068984782363, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13860237930047585111}, 'section': 'Section::::Abstract.'}]}]