Question: what allows chyme to enter the small intestine
[{'answer': 'pyloric valve', 'provenance': [{'wikipedia_id': '351616', 'title': 'Chyme', 'start_paragraph_id': 1, 'start_character': 147, 'end_paragraph_id': 1, 'end_character': 160, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'the pyloric valve', 'provenance': [{'wikipedia_id': '351616', 'title': 'Chyme', 'start_paragraph_id': 1, 'start_character': 143, 'end_paragraph_id': 1, 'end_character': 160, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '351616', 'title': 'Chyme', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2114264147642976882}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '351616', 'title': 'Chyme', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 217, 'bleu_score': 0.803333163928579, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2114264147642976882}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '351616', 'title': 'Chyme', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 842, 'bleu_score': 0.8358644621959871, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2114264147642976882}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '353070', 'title': 'Epiglottis', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['It stands open during breathing, allowing air into the larynx. During swallowing, it closes to prevent aspiration and forcing the swallowed liquids or food to go along the esophagus instead. It is thus the valve that diverts passage to either the trachea or the esophagus.', 'The epiglottis is a flap in the throat that keeps food from entering the windpipe and the lungs. The flap is made of elastic cartilage covered with a mucous membrane, attached to the entrance of the larynx. It projects obliquely upwards behind the tongue and the hyoid bone, pointing dorsally. It stands open during breathing, allowing air into the larynx. During swallowing, it closes to prevent aspiration and forcing the swallowed liquids or food to go along the esophagus instead. It is thus the valve that diverts passage to either the trachea or the esophagus.', 'The epiglottis is a flap in the throat that keeps food from entering the windpipe and the lungs. The flap is made of elastic cartilage covered with a mucous membrane, attached to the entrance of the larynx']}}]}, {'provenance': [{'wikipedia_id': '99610', 'title': 'Small intestine', 'section': 'Section::::Structure.:Development.\n', 'start_paragraph_id': 18, 'end_paragraph_id': 18, 'meta': {'evidence_span': ['This process creates the twisted shape of the large intestine. Food from the stomach is allowed into the duodenum through the pylorus by a muscle called the pyloric sphincter. The small intestine is where most chemical digestion takes place. Many of the digestive enzymes that act in the small intestine are secreted by the pancreas and liver and enter the small intestine via the pancreatic duct. Pancreatic enzymes and bile from', 'The small intestine develops from the midgut of the primitive gut tube. By the fifth week of embryological life, the ileum begins to grow longer at a very fast rate, forming a U-shaped fold called the primary intestinal loop. The loop grows so fast in length that it outgrows the abdomen and protrudes through the umbilicus. By week 10, the loop retracts back into the abdomen. Between weeks six and ten the small intestine rotates anticlockwise, as viewed from the front of the embryo. It rotates a further 180 degrees after it has moved back into the abdomen. This process creates the twisted shape of the large intestine. Food from the stomach is allowed into the duodenum through the pylorus by a muscle called the pyloric sphincter. The small intestine is where most chemical digestion takes place.']}}]}, {'provenance': [{'wikipedia_id': '351616', 'title': 'Chyme', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Chyme or chymus (; from Greek χυμός "khymos", "juice") is the semi-fluid mass of partly digested food that is expelled by the stomach, through the pyloric valve, into the duodenum (the beginning of the small intestine).', 'Chyme or chymus (; from Greek χυμός "khymos", "juice") is the semi-fluid mass of partly digested food that is expelled by the stomach, through the pyloric valve, into the duodenum (the beginning of the small intestine).\rhighlight sentence(s) containing evidence, not only the answer', 'Chyme or chymus (; from Greek χυμός "khymos", "juice") is the semi-fluid mass of partly digested food that is expelled by the stomach, through the pyloric valve, into the duodenum (the beginning of the small intestine)']}}]}, {'provenance': [{'wikipedia_id': '99599', 'title': 'Ileum', 'section': 'Section::::Structure.\n', 'start_paragraph_id': 5, 'end_paragraph_id': 5, 'meta': {'evidence_span': ['ileum is about 24 m long, and the pH is usually between 7 and 8 (neutral or slightly basic). "Ileum "is derived from the Greek word "eilein", meaning "to twist up tightly". The ileum is the third and final part of the small intestine. It follows the jejunum and ends at the ileocecal junction, where the terminal ileum communicates with the cecum of the large intestine through the ileocecal valve. The ileum, along with the jejunum, is suspended inside the mesentery, a peritoneal formation that carries the blood vessels supplying them (the superior mesenteric artery and vein), lymphatic vessels and nerve fibers.', 'ileum is about 24 m long, and the pH is usually between 7 and 8 (neutral or slightly basic). "Ileum "is derived from the Greek word "eilein", meaning "to twist up tightly". The ileum is the third and final part of the small intestine. It follows the jejunum and ends at the ileocecal junction, where the terminal ileum communicates with the cecum of the large intestine through the ileocecal valve. The ileum, along with the jejunum, is suspended inside the mesentery, a peritoneal formation that carries the blood vessels supplying them (the superior mesenteric artery and vein), lymphatic vessels and nerve fibers.', 'ileum is about 24 m long, and the pH is usually between 7 and 8 (neutral or slightly basic). "Ileum "is derived from the Greek word "eilein", meaning "to twist up tightly". The ileum is the third and final part of the small intestine']}}]}]