Question

which is not an accessory organ of the digestive system?
a liver
b pancreas
c salivary gland
d anus

Explanation:

The digestive system's accessory organs aid digestion but are not part of the alimentary canal. The liver produces bile, the pancreas secretes digestive enzymes, and salivary glands produce saliva. The anus is the terminal part of the alimentary canal (the main digestive tract), not an accessory organ.

Answer:

D. anus