Question: how long is the gestation period for humpback whales
[{'answer': '11.5 months', 'provenance': [{'wikipedia_id': '231728', 'title': 'Humpback whale', 'start_paragraph_id': 31, 'start_character': 74, 'end_paragraph_id': 31, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Behavior.:Courtship and reproduction.\n'}]}, {'provenance': [{'wikipedia_id': '231728', 'title': 'Humpback whale', 'start_paragraph_id': 31, 'start_character': 0, 'end_paragraph_id': 31, 'end_character': 496, 'bleu_score': 0.9731482306711111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17296270472458310290}, 'section': 'Section::::Behavior.:Courtship and reproduction.\n'}]}]