Question: where are the dopamine receptors located in the brain
[{'answer': 'reward pathway', 'provenance': [{'wikipedia_id': '737439', 'title': 'Dopamine receptor', 'start_paragraph_id': 53, 'start_character': 57, 'end_paragraph_id': 53, 'end_character': 71, 'bleu_score': 1.0, 'section': 'Section::::In disease.:Addictive drugs.\n'}]}, {'provenance': [{'wikipedia_id': '737439', 'title': 'Dopamine receptor', 'start_paragraph_id': 53, 'start_character': 0, 'end_paragraph_id': 53, 'end_character': 596, 'bleu_score': 0.976043556018343, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7399573881910350205}, 'section': 'Section::::In disease.:Addictive drugs.\n'}]}]