Question: who demonstrated that a reflex could be conditioned to a neutral stimulus
[{'answer': 'B.F. Skinner', 'provenance': [{'wikipedia_id': '128027', 'title': 'Operant conditioning', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Historical note.:B. F. Skinner.\n'}]}, {'provenance': [{'wikipedia_id': '128027', 'title': 'Operant conditioning', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 525, 'bleu_score': 0.8354044111627921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10273104932036796656}, 'section': 'Section::::Historical note.:B. F. Skinner.\n'}]}]