Question: who was president when the afghanistan war started
[{'answer': 'George W. Bush', 'provenance': [{'wikipedia_id': '4293656', 'title': 'United States invasion of Afghanistan', 'start_paragraph_id': 2, 'start_character': 15, 'end_paragraph_id': 2, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4293656', 'title': 'United States invasion of Afghanistan', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 968, 'bleu_score': 0.9285469306702131, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3126521758568862282}, 'section': 'Section::::Abstract.'}]}]