The correct option is a.pharynx.
The gastrointestinal system includes the organs and glands involved in the digestion and absorption of food. It includes the oesophagus, stomach, small intestines, large intestine, liver and pancreas. The food is broken down into smaller particles in the stomach.
The food is then acted upon by various enzymes to reduce them into simplest forms which facilitate their absorption.
The pharynx serves as a common passage for food and air. It is a part of the digestive system and conducting zone of the respiratory system. The human pharynx has three parts-nasopharynx, oropharynx and laryngopharynx. It is also important in vocalisation.
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