The question is incomplete as it does not have the option which are:
A. Epithelial. B. Muscle. C. Nervous. D. Connective.
Answer:
A. Epithelial
Step-by-step explanation:
The epithelium layer plays a major role in the digestive system which are that it lines the digestive tracts and helps in the secretion of digestive enzymes, mucus and helps in the absorption of the digestive food.
The epithelium present in the mouth, pharynx and alimentary canal differs from the epithelium of the stomach and intestine.
In the stomach, the epithelium is present in the mucosa layer which helps in the protection of stomach and secretes digestive enzymes and in the intestine is involved in the absorption of the food.
Therefore, if a problem arises according to the question, therefore, the epithelium is the tissue which will be affected.
Thus, Option-A is the correct answer.