Question: where is reticular formation located on the brain
[{'answer': 'brainstem', 'provenance': [{'wikipedia_id': '1507921', 'title': 'Reticular formation', 'start_paragraph_id': 1, 'start_character': 90, 'end_paragraph_id': 1, 'end_character': 99, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1507921', 'title': 'Reticular formation', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 649, 'bleu_score': 0.931187671878629, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15495869844201162670}, 'section': 'Section::::Abstract.'}]}]