Question: the part of the brain that regulates the production of the hormone melatonin is called
[{'answer': 'the pineal gland', 'provenance': [{'wikipedia_id': '285157', 'title': 'Melatonin', 'start_paragraph_id': 1, 'start_character': 88, 'end_paragraph_id': 1, 'end_character': 104, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]