<prompt> Which is a feature of osmotic diarrhoea :Volume 1litreDecreasesstops with fastingMostly infectious etiologyOsmotic gap 50mmol  <response>: Osmotic diarrhoea results from the presence of osmotically active, poorly absorbed solutes in the bowel lumen that inhibit normal water and electrolyte absorption. Ceain laxatives such as lactulose and citrate of magnesia or maldigestion of ceain food substances such as milk are common causes of osmotic diarrhoea. An increased osmotic load can be measured in the stool. This type of diarrhoea ceases with fasting. Osmotic diarrhoea: Volume 1litre Decreasesstops with fasting Osmotic gap 100 mmoll ref : harrisons 20th ed 