ANATOMY

Detailed explanation-1: -The correct option is A liver. The digestive system of humans consists of: The alimentary canal includes the buccal cavity, oesophagus, stomach, small intestine large intestine, rectum and anus. Whereas liver is an accessory glands which plays supportive role in the process of digestion.

Detailed explanation-2: -The accessory organs are the teeth, tongue, and glandular organs such as salivary glands, liver, gallbladder, and pancreas. The digestive system functions to provide mechanical processing, digestion, absorption of food, secretion of water, acids, enzymes, buffer, salt, and excretion of waste products.

Detailed explanation-3: -The alimentary tract of the digestive system is composed of the mouth, pharynx, esophagus, stomach, small and large intestines, rectum and anus. Associated with the alimentary tract are the following accessory organs: salivary glands, liver, gallbladder, and pancreas.

Detailed explanation-4: -Pancreas, gall bladder and liver are the three accessory organs in digestive system.