Question: which structure of the brain stem is primarily related to alertness
[{'answer': 'Reticular formation', 'provenance': [{'wikipedia_id': '233528', 'title': 'Brainstem', 'start_paragraph_id': 8, 'start_character': 122, 'end_paragraph_id': 8, 'end_character': 141, 'bleu_score': 1.0, 'section': 'Section::::Structure.:Parts.:Midbrain.\n'}]}]