Cause of his abdominal symptoms

A 44 year old male comes in to your office with what he calls sensitivity to gluten and this rash which has been there approximately 2 months without resolution. What is the most likely cause of his abdominal symptoms and rash?

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a. Ulcerative colitis.
b. Celiac Disease
c. Irritable bowel syndrome
d. Cushing’s disease
e. Small intestine Bacterial overgrowth syndrome (SIBO)