Question: philadelphia is known as the city of what
[{'answer': 'Brotherly Love', 'provenance': [{'wikipedia_id': '50585', 'title': 'Philadelphia', 'start_paragraph_id': 9, 'start_character': 54, 'end_paragraph_id': 9, 'end_character': 68, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'City of Brotherly Love'}, {'provenance': [{'wikipedia_id': '45288364', 'title': 'Nicknames of Philadelphia', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Philadelphia has long been nicknamed "The City of Brotherly Love" or "The City of Brotherly Love and Sisterly Affection" from the literal meaning of the city\'s name in Greek ( (, ), "brotherly love"), derived from the Ancient Greek terms φίλος "phílos" (beloved, dear, or loving) and δελφός "adelphós" (brother, brotherly). The city was first named by its founder, William Penn.', 'Philadelphia has long been nicknamed "The City of Brotherly Love"', 'Philadelphia has long been nicknamed "The City of Brotherly Love" or "The City of Brotherly Love and Sisterly Affection" from the literal meaning of the city\'s name in Greek ( (, ), "brotherly love"), derived from the Ancient Greek terms φίλος "phílos" (beloved, dear, or loving) and δελφός "adelphós" (brother, brotherly). The city was first named by its founder, William Penn. "Philadelphia" is also frequently shortened to simply Philly . The Philadelphia Phillies']}}]}]