Question: where is the reward pathway located in the brain
[{'answer': 'the midbrain', 'provenance': [{'wikipedia_id': '386218', 'title': 'Mesolimbic pathway', 'start_paragraph_id': 1, 'start_character': 160, 'end_paragraph_id': 1, 'end_character': 172, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '386218', 'title': 'Mesolimbic pathway', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 784, 'bleu_score': 0.8443607091204001, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3815357909680057751}, 'section': 'Section::::Abstract.'}]}]