Question: who was the first executive president of guyana
[{'answer': 'Arthur Chung', 'provenance': [{'wikipedia_id': '1801519', 'title': 'Arthur Chung', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Forbes Burnham', 'provenance': [{'wikipedia_id': '1801519', 'title': 'Arthur Chung', 'start_paragraph_id': 1, 'start_character': 327, 'end_paragraph_id': 1, 'end_character': 341, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1801519', 'title': 'Arthur Chung', 'start_paragraph_id': 1, 'start_character': 62, 'end_paragraph_id': 1, 'end_character': 425, 'bleu_score': 0.7463297868345351, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14353878693552812755}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1801519', 'title': 'Arthur Chung', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 337, 'bleu_score': 0.8639489085178421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14353878693552812755}, 'section': 'Section::::Presidency.\n'}]}, {'provenance': [{'wikipedia_id': '21256626', 'title': 'Constitution of Guyana', 'section': 'Section::::Independence constitution.\n', 'start_paragraph_id': 12, 'end_paragraph_id': 12, 'meta': {'evidence_span': ["Arthur Chung, a Chinese-Guyanese, was the country's first president.", "The governor general, heretofore the ceremonial head of state, was replaced by a president, also a ceremonial figure. Arthur Chung, a Chinese-Guyanese, was the country's first president.", "organizing the population into cooperatives would provide the best path to development. The 1970 proclamation severed Guyana's last significant constitutional tie to Britain. The governor general, heretofore the ceremonial head of state, was replaced by a president, also a ceremonial figure. Arthur Chung, a Chinese-Guyanese, was the country's first president. Although its ties to the British monarch were broken, Guyana remained within the Commonwealth of Nations. Membership in the Commonwealth allowed Guyana to reap the benefits of access to markets in Britain and to retain"]}}]}, {'provenance': [{'wikipedia_id': '1801519', 'title': 'Arthur Chung', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Arthur Raymond Chung (10 January 1918 23 June 2008) was the first President of Guyana from 1970 to 1980.', 'Arthur Raymond Chung (10 January 1918 23 June 2008) was the first President of Guyana from 1970 to 1980. He was the first ethnic Chinese (Hakka Han) head of state in a non-Asian country. During his time as President of Guyana, the office was that of a ceremonial head of state, with real power in the hands of Prime Minister Forbes Burnham.']}}]}]