Question: who was the psychologist responsible for originating the theory of attachment
[{'answer': 'John Bowlby', 'provenance': [{'wikipedia_id': '18756845', 'title': 'History of attachment theory', 'start_paragraph_id': 1, 'start_character': 46, 'end_paragraph_id': 1, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18756845', 'title': 'History of attachment theory', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 235, 'bleu_score': 0.934334813046729, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13927507687158194418}, 'section': 'Section::::Abstract.'}]}]