Question: the active form of vitamin d also known as a hormone is called
[{'answer': 'calcitriol', 'provenance': [{'wikipedia_id': '24998247', 'title': 'Vitamin D', 'start_paragraph_id': 3, 'start_character': 482, 'end_paragraph_id': 3, 'end_character': 492, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]