Question: what structures absorb most of the products of digestion in the small intestine
[{'answer': 'villi', 'provenance': [{'wikipedia_id': '99610', 'title': 'Small intestine', 'start_paragraph_id': 2, 'start_character': 192, 'end_paragraph_id': 2, 'end_character': 197, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]