Question: where is the 18th congressional district in pennsylvania
[{'answer': 'southern suburbs of Pittsburgh', 'provenance': [{'wikipedia_id': '8397919', 'title': "Pennsylvania's 18th congressional district", 'start_paragraph_id': 6, 'start_character': 94, 'end_paragraph_id': 6, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::History.:Pre-2018 boundaries.\n'}]}, {'provenance': [{'wikipedia_id': '8397919', 'title': "Pennsylvania's 18th congressional district", 'start_paragraph_id': 6, 'start_character': 55, 'end_paragraph_id': 6, 'end_character': 573, 'bleu_score': 0.7374101347638811, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11177838962375609552}, 'section': 'Section::::History.:Pre-2018 boundaries.\n'}]}]