Question: who are the current members of the band kansas
[{'answer': 'Phil Ehart', 'provenance': [{'wikipedia_id': '148551', 'title': 'Kansas (band)', 'start_paragraph_id': 5, 'start_character': 166, 'end_paragraph_id': 5, 'end_character': 176, 'bleu_score': 1.0, 'section': 'Section::::History.:1970–1973: Early years.\n'}]}, {'answer': 'Rich Williams', 'provenance': [{'wikipedia_id': '148551', 'title': 'Kansas (band)', 'start_paragraph_id': 7, 'start_character': 254, 'end_paragraph_id': 7, 'end_character': 267, 'bleu_score': 1.0, 'section': 'Section::::History.:1970–1973: Early years.\n'}]}, {'answer': 'Billy Greer', 'provenance': [{'wikipedia_id': '148551', 'title': 'Kansas (band)', 'start_paragraph_id': 24, 'start_character': 280, 'end_paragraph_id': 24, 'end_character': 291, 'bleu_score': 1.0, 'section': 'Section::::History.:1985–1990: Reformation.\n'}]}, {'answer': 'David Ragsdale', 'provenance': [{'wikipedia_id': '148551', 'title': 'Kansas (band)', 'start_paragraph_id': 29, 'start_character': 34, 'end_paragraph_id': 29, 'end_character': 48, 'bleu_score': 1.0, 'section': 'Section::::History.:1985–1990: Reformation.\n'}]}, {'answer': 'David Manion', 'provenance': [{'wikipedia_id': '148551', 'title': 'Kansas (band)', 'start_paragraph_id': 51, 'start_character': 76, 'end_paragraph_id': 51, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::History.:2014–present: Retirement of Steve Walsh, "The Prelude Implicit".\n'}]}, {'answer': 'Ronnie Platt', 'provenance': [{'wikipedia_id': '148551', 'title': 'Kansas (band)', 'start_paragraph_id': 50, 'start_character': 110, 'end_paragraph_id': 50, 'end_character': 122, 'bleu_score': 1.0, 'section': 'Section::::History.:2014–present: Retirement of Steve Walsh, "The Prelude Implicit".\n'}]}, {'answer': 'Zak Rizvi', 'provenance': [{'wikipedia_id': '148551', 'title': 'Kansas (band)', 'start_paragraph_id': 53, 'start_character': 543, 'end_paragraph_id': 53, 'end_character': 552, 'bleu_score': 1.0, 'section': 'Section::::History.:2014–present: Retirement of Steve Walsh, "The Prelude Implicit".\n'}]}]