Question: which meninx covers the surface of the brain and spinal cord
[{'answer': 'pia mater', 'provenance': [{'wikipedia_id': '398932', 'title': 'Meninges', 'start_paragraph_id': 1, 'start_character': 214, 'end_paragraph_id': 1, 'end_character': 223, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '398932', 'title': 'Meninges', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 453, 'bleu_score': 0.9245712963830611, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13604061393946314438}, 'section': 'Section::::Structure.:Pia mater.\n'}]}]