To solve this problem, we need to analyze each statement to determine which one is not correct:$\newline \bullet$Option 1: Brunner's glands are present in the submucosa of the stomach and secrete pepsinogen.$\newline$ - Brunner's glands are actually located in the submucosa of the duodenum, not the stomach.$\newline$ - They secrete an alkaline mucus to protect the duodenal lining and neutralize gastric acid.$\newline$ - Therefore, this statement is incorrect.$\newline \bullet$Option 2: Goblet cells are present in the mucosa of the intestine and secrete mucus.$\newline$ - Goblet cells are indeed found in the mucosa of the intestine.$\newline$ - They secrete mucus to lubricate and protect the intestinal lining.$\newline$ - This statement is correct.$\newline \bullet$Option 3: Oxyntic cells are present in the mucosa of the stomach and secrete HCl.$\newline$ - Oxyntic cells, also known as parietal cells, are located in the gastric glands of the stomach mucosa.$\newline$ - They secrete hydrochloric acid (HCl) which aids in digestion.$\newline$ - This statement is correct.$\newline \bullet$Option 4: Acini are present in the pancreas and secrete carboxypeptidase.$\newline$ - Acinar cells in the pancreas produce digestive enzymes, including carboxypeptidase.$\newline$ - This statement is correct.$\newline$Based on the analysis, the incorrect statement is Option 1.$\newline$Therefore, the correct answer is Option 1.