Question: what is the most common language spoken in afghanistan
[{'answer': 'Pashto', 'provenance': [{'wikipedia_id': '7719033', 'title': 'Languages of Afghanistan', 'start_paragraph_id': 1, 'start_character': 75, 'end_paragraph_id': 1, 'end_character': 81, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Dari', 'provenance': [{'wikipedia_id': '7719033', 'title': 'Languages of Afghanistan', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 4, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]