Question: who conducted the little albert study on conditioned fear
[{'answer': 'John B. Watson', 'provenance': [{'wikipedia_id': '500998', 'title': 'Little Albert experiment', 'start_paragraph_id': 1, 'start_character': 206, 'end_paragraph_id': 1, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'his graduate student , Rosalie Rayner'}, {'provenance': [{'wikipedia_id': '500998', 'title': 'Little Albert experiment', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 394, 'bleu_score': 0.9663744727315161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13622967945148499299}, 'section': 'Section::::Abstract.'}]}]