Question: where are pnc banks located in the us
[{'answer': 'nineteen states'}, {'answer': 'the District of Columbia', 'provenance': [{'wikipedia_id': '1265489', 'title': 'PNC Financial Services', 'start_paragraph_id': 1, 'start_character': 209, 'end_paragraph_id': 1, 'end_character': 233, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]