Question: when did the canon rebel xti come out
[{'answer': '24 August 2006', 'provenance': [{'wikipedia_id': '6652457', 'title': 'Canon EOS 400D', 'start_paragraph_id': 1, 'start_character': 164, 'end_paragraph_id': 1, 'end_character': 178, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6652457', 'title': 'Canon EOS 400D', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 178, 'bleu_score': 0.9402297675816911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6142671279778476265}, 'section': 'Section::::Abstract.'}]}]