Question: when was the last time a foreign leader addressed congress
[{'answer': 'June 8 , 2016', 'provenance': [{'wikipedia_id': '2667749', 'title': 'Joint session of the United States Congress', 'start_paragraph_id': 16, 'start_character': 154, 'end_paragraph_id': 16, 'end_character': 167, 'bleu_score': 1.0, 'section': 'Section::::Subjects of joint sessions and meetings.:Foreign dignitaries.\n'}]}, {'provenance': [{'wikipedia_id': '2667749', 'title': 'Joint session of the United States Congress', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 298, 'bleu_score': 0.7485240782377781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14710093335104655520}, 'section': 'Section::::Subjects of joint sessions and meetings.:Foreign dignitaries.\n'}]}]