Question: when do most mammals lose their ability to produce lactase
[{'answer': 'after weaning', 'provenance': [{'wikipedia_id': '2644987', 'title': 'Lactase persistence', 'start_paragraph_id': 1, 'start_character': 224, 'end_paragraph_id': 1, 'end_character': 237, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2644987', 'title': 'Lactase persistence', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 737, 'bleu_score': 0.9812185674664711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17034500749395076174}, 'section': 'Section::::Abstract.'}]}]