Which of the following controls the flow of chyme from the stomach into the small intestine?

This question is asking about control of the flow of chyme from the stomach into the small intestine. The anatomic feature of the alimentary canal between the stomach and duodenum, the first part of the small intestine, is the pyloric sphincter. The esophageal sphincter separates the esophagus from the stomach. The ileocecal valve separates the small intestine from the large intestine. The epiglottal flap, more properly referred to as the epiglottis, is a flap of cartilage that covers the trachea and routes food to the esophagus during swallowing.