Question

non-tropical sprue is caused by an immune reaction to what protein?

Explanation:

Non - tropical sprue, also known as coeliac disease, is an autoimmune disorder. In this condition, the immune system reacts to gluten. Gluten is a protein found in wheat, barley, and rye. When a person with coeliac disease consumes gluten, the immune system mistakenly attacks the lining of the small intestine. This immune reaction is triggered specifically by gluten.

Answer:

Gluten