Question: who wrote the classic defense of personal freedom and individuality entitled on liberty
[{'answer': 'John Stuart Mill', 'provenance': [{'wikipedia_id': '743486', 'title': 'On Liberty', 'start_paragraph_id': 1, 'start_character': 62, 'end_paragraph_id': 1, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '743486', 'title': 'On Liberty', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 846, 'bleu_score': 0.984188478234951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2930523190957307320}, 'section': 'Section::::Abstract.'}]}]