Question: how many novels of sherlock holmes are there
[{'answer': 'four', 'provenance': [{'wikipedia_id': '7254152', 'title': 'Canon of Sherlock Holmes', 'start_paragraph_id': 1, 'start_character': 81, 'end_paragraph_id': 1, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7254152', 'title': 'Canon of Sherlock Holmes', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 285, 'bleu_score': 0.957870874785216, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17299639276115354297}, 'section': 'Section::::Abstract.'}]}]