The faeces enters into the caecum of the large intestine through ‘X’ which prevents the backflow of the faecal matter. ‘X’ is
ileo-caecal valve
Stensen duct
Duct of Wirsung
Hepato-pancreatic duct
The undigested, unabsorbed substances called feces enter into the caecum of the large intestine through ileo-caecal valve, which prevents the backflow of the fecal matter. Hence, the correct answer is option 1.