To solve this problem, we need to identify the location of the Sphincter of Oddi. Let's analyze the options:$\newline \bullet$Option 1: Ileo-caecal junction - This is the junction between the ileum and the caecum in the digestive tract. It is not related to the Sphincter of Oddi.$\newline \bullet$Option 2: Junction of hepato-pancreatic duct and duodenum - The Sphincter of Oddi is located at this junction. It controls the flow of bile and pancreatic juice into the duodenum.$\newline \bullet$Option 3: Gastro-oesophageal junction - This is the junction between the stomach and the esophagus, which is not related to the Sphincter of Oddi.$\newline \bullet$Option 4: Junction of jejunum and duodenum - This is the junction between the duodenum and jejunum, which is not related to the Sphincter of Oddi.$\newline$Therefore, the correct location of the Sphincter of Oddi is at the junction of the hepato-pancreatic duct and duodenum.$\newline$This corresponds to Option 2.