Question: who is the president of the republic of zambia
[{'answer': 'Edgar Lungu', 'provenance': [{'wikipedia_id': '450150', 'title': 'President of Zambia', 'start_paragraph_id': 1, 'start_character': 330, 'end_paragraph_id': 1, 'end_character': 341, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '450150', 'title': 'President of Zambia', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 454, 'bleu_score': 0.9731482306711111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15294326767242887545}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44307356', 'title': 'Edgar Lungu', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Edgar Chagwa Lungu (born 11 November 1956) is a Zambian politician who has been the President of Zambia since January 2015.', 'Edgar Chagwa Lungu (born 11 November 1956) is a Zambian politician who has been the President of Zambia since January 2015', 'Edgar Chagwa Lungu (born 11 November 1956) is a Zambian politician who has been the President of Zambia since January 2015. Under President Michael Sata, Lungu served as Minister of Justice and Minister of Defence.']}}]}, {'provenance': [{'wikipedia_id': '450150', 'title': 'President of Zambia', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Since 1991, when Kaunda left the Presidency, the office has been held by five others: Frederick Chiluba, Levy Mwanawasa, Rupiah Banda, Michael Sata, and current President Edgar Lungu.', 'The President of Zambia is the head of state and the head of government of Zambia. The office was first held by Kenneth Kaunda following independence in 1964. Since 1991, when Kaunda left the Presidency, the office has been held by five others: Frederick Chiluba, Levy Mwanawasa, Rupiah Banda, Michael Sata, and current President Edgar Lungu. In addition, Acting President Guy Scott served in an interim capacity after the death of President Michael Sata']}}]}]