Bruner's gland are characteristic feature of Jejunum of small intestine, Ileum, Duodenum, Fundic region stomach

Brunner's gland is a characteristic feature of duodenum part of small intestine. It is found in the submucosa of the duodenum and secret two important vitamin secretin and cholecystokinin, which in turn stimulate pancreas and gall bladder. So, the correct answer is option B.