Question: in which layer of the intestine does most chemical digestion take place
[{'answer': 'small intestine', 'provenance': [{'wikipedia_id': '99610', 'title': 'Small intestine', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '99610', 'title': 'Small intestine', 'start_paragraph_id': 22, 'start_character': 0, 'end_paragraph_id': 22, 'end_character': 664, 'bleu_score': 0.9808590314834971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13327421824764040289}, 'section': 'Section::::Function.:Digestion.\n'}]}]