Question: which layer of the digestive tract is in direct contact with digested food
[{'answer': 'mucosa', 'provenance': [{'wikipedia_id': '41543593', 'title': 'Gastrointestinal wall', 'start_paragraph_id': 6, 'start_character': 45, 'end_paragraph_id': 6, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '41543593', 'title': 'Gastrointestinal wall', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 204, 'bleu_score': 0.943604326170661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13575183494813531388}, 'section': 'Section::::Structure.:Mucosa.\n'}]}]