Correct Option (c) duodenum
Explanation:
Secretin and cholecystokinin (CCK) are two man gastrointestinal (GI) hormones secreted in duodenum of alimentary canal. CCK stimulates gall bladder contraction and thus increases the flow of bile salts into the intestine.
Secretin stimulates the release of an alkaline pancreatic fluid that neutralises stomach acid as it enters the intestine.
