Question: what type of epithelial tissue forms the lining of the stomach
[{'answer': 'Columnar epithelium', 'provenance': [{'wikipedia_id': '299641', 'title': 'Epithelium', 'start_paragraph_id': 9, 'start_character': 12, 'end_paragraph_id': 9, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Classification.\n'}]}]