OFFICIAL EXPLANATION

The text tells us that celiac disease results when the body mistakes gluten for a harmful pathogen, causing damage to the intestine. We are also told that gluten is a protein found in certain grains, and that people suffering from celiac disease must eliminate it from their diets. Finally, we are told that symptoms of the disease include cramps, bloating, and anemia. We need to find an answer choice that is inferable from these facts alone.

(A) Anemia is just one of several symptoms of the disease. We do not know whether everyone who has the disease will also develop anemia.

(B) We do not know whether eliminating gluten will cure the disease, only that people with the disease must not eat gluten. Perhaps the disease will exist anyway in a latent form.

(C) We do not know whether the symptoms mentioned are also symptoms of other conditions.

(D) We do not know whether gluten is found only in grains. It may exist in other foods as well.

(E) CORRECT. If the body mistakes gluten for a harmful pathogen, then it must be true that the body cannot always recognize harmless substances.