Question: what president gave the most speeches from the oval office
[{'answer': 'President Ronald Reagan', 'provenance': [{'wikipedia_id': '28545126', 'title': 'Oval Office address', 'start_paragraph_id': 7, 'start_character': 204, 'end_paragraph_id': 7, 'end_character': 227, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '28545126', 'title': 'Oval Office address', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 557, 'bleu_score': 0.8832017805794311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4519486148199328944}, 'section': 'Section::::Background.\n'}]}]