This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
Which of the following motor events is integrated entirely within the ENS? 
Select and explain. 
A. Intesto-intestinal reflex, B. Recto-sphincteric reflex, C. Gastro-ileal reflex, D. Peristaltic reflex
D: Peristaltic reflex
Answer: D: Peristaltic reflex 
Explanation: Gastrointestinal reflexes Reflexes are integrated entirely within the GIT wall enteric nervous system. These reflexes include : 1.Peristalsis 2.Mixing contractions 3. Local inhibitory effects. Reflexes from GIT to preveebral sympathetic ganglia & then back to GIT Gastrocolic reflexes Enterogastric reflexes Colonoileal reflexes Reflexes from GIT to spinal cord or brain stem & then back to the GIT Reflexes from the stomach & duodenum to the brain stem & back to stomach Pain reflexes that cause general inhibition of the entire GIT Defecation reflexes.