Question: which company's ticker symbol in nyse is 'c'
[{'answer': 'Citigroup', 'provenance': [{'wikipedia_id': '153897', 'title': 'Ticker symbol', 'start_paragraph_id': 27, 'start_character': 16, 'end_paragraph_id': 27, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Symbols by country.:United States.\n'}]}]