<prompt> Sub-mucosal glands are present in?DuodenumColonAnal canalStomach  <response>: Duodenum and oesophagus have submucosal glands. The submucosa of the duodenum is densely packed with mucous Brunner;s glands.The oesophagus has occasional submucosal mucous glands.Reference: Chaurasia; 6th edition 