Question: what does a silent dog whistle sound like
[{'answer': 'a quiet hissing sound', 'provenance': [{'wikipedia_id': '316047', 'title': 'Dog whistle', 'start_paragraph_id': 3, 'start_character': 40, 'end_paragraph_id': 3, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '316047', 'title': 'Dog whistle', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 488, 'bleu_score': 0.9766041382465441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14577988529248306199}, 'section': 'Section::::Abstract.'}]}]