Question: what do the initials pnc stand for in pnc bank
[{'answer': 'Pittsburgh National Corporation', 'provenance': [{'wikipedia_id': '1265489', 'title': 'PNC Financial Services', 'start_paragraph_id': 3, 'start_character': 93, 'end_paragraph_id': 3, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]