Question: in the little albert study what was the unconditioned stimulus
[{'answer': 'loud noises', 'provenance': [{'wikipedia_id': '500998', 'title': 'Little Albert experiment', 'start_paragraph_id': 2, 'start_character': 100, 'end_paragraph_id': 2, 'end_character': 111, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '500998', 'title': 'Little Albert experiment', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 433, 'bleu_score': 0.9716239638199891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2502933934477927394}, 'section': 'Section::::Abstract.'}]}]