Question: where does action potential start in a neuron
[{'answer': 'the axon hillock', 'provenance': [{'wikipedia_id': '156998', 'title': 'Action potential', 'start_paragraph_id': 10, 'start_character': 729, 'end_paragraph_id': 10, 'end_character': 745, 'bleu_score': 1.0, 'section': 'Section::::Overview.:Process in a typical neuron.\n'}]}, {'provenance': [{'wikipedia_id': '156998', 'title': 'Action potential', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 1379, 'bleu_score': 0.9753523890679601, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8777358487948741525}, 'section': 'Section::::Overview.:Process in a typical neuron.\n'}]}]