ANSWER: (D) CELIAC DISEASE
EXPLANATION: CELIAC DISEASE refers to an immune reaction to consumption of food that contains gluten. Gluten is a protein that is found in wheat, barley and rye.
However, after consumption of gluten, the immune reaction to this problem elicits inflammation that can damage the epithelial lining of the small intestine, severe stomach aches, diarrhea and other medical complications.
Thus, Thompson is suspected of having celiac disease due to his bodily reactions after consuming sandwiches, cookies, crackers, and pancakes, which are produced using wheat, barley, or rye (which have the presence of gluten).