This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
All of the following are true about intestinal motility except 
Select and explain. 
A. Increased by distension, B. Depends on gastric motility, C. Increased by cholecystokinin, D. Increased by secretin
D: Increased by secretin
Answer: D: Increased by secretin 
Explanation: "Peristaltic activity of the small intestine is greatly increased after a meal. This increased activity is caused paly by the beginning entry of chyme into the duodenum, causing stretch of the duodenal wall. In addition, peristaltic activity is increased by the so-called gastroenteric reflex that is initiated by distention of the stomach and conducted principally through the myenteric plexus from the stomach down along the wall of the small intestine." "In addition to the nervous signals that may affect small intestinal peristalsis, several hormonal factors also affect peristalsis. These factors include gastrin, CCK, insulin, motilin, and serotonin, all of which enhance intestinal motility and are secreted during various phases of food processing. Conversely, secretin and glucagon inhibit small intestinal motility." Reference: Guyton Physiology, 13th ed, Page: 813