Question: when does clark reveal his secret to chloe
[{'answer': 'season five premiere', 'provenance': [{'wikipedia_id': '571397', 'title': 'Chloe Sullivan', 'start_paragraph_id': 7, 'start_character': 38, 'end_paragraph_id': 7, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::Role in "Smallville".\n'}]}, {'provenance': [{'wikipedia_id': '571397', 'title': 'Chloe Sullivan', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 1902, 'bleu_score': 0.9937596742126341, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 855847890853098190}, 'section': 'Section::::Role in "Smallville".\n'}]}]