Question: what is the most abundant type of cell in the nervous system
[{'answer': 'neurons , or nerve cells', 'provenance': [{'wikipedia_id': '267694', 'title': 'Nervous tissue', 'start_paragraph_id': 1, 'start_character': 383, 'end_paragraph_id': 1, 'end_character': 407, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '267694', 'title': 'Nervous tissue', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 580, 'bleu_score': 0.6514080170787111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12084771880287378452}, 'section': 'Section::::Abstract.'}]}]