Question: what was the neutral stimulus in little albert
[{'answer': 'A white laboratory rat', 'provenance': [{'wikipedia_id': '500998', 'title': 'Little Albert experiment', 'start_paragraph_id': 6, 'start_character': 92, 'end_paragraph_id': 6, 'end_character': 114, 'bleu_score': 1.0, 'section': 'Section::::Method.\n'}]}, {'provenance': [{'wikipedia_id': '500998', 'title': 'Little Albert experiment', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 858, 'bleu_score': 0.7377789987063481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6153020732601816652}, 'section': 'Section::::Method.\n'}]}]