You are answering a USMLE-style medical question. Question: A 32-year-old Caucasian woman is referred to a gastroenterologist by her family physician for 8 months of abdominal pain, foul-smelling diarrhea with floating, bulky stools, weight loss, and macrocytic anemia. Her personal history is relevant for allergic rhinitis. Physical examination shows grouped, erythematous papulovesicular lesions on her arms, torso, and abdomen. Which of the following is the most appropriate approach for the management of this patient? Options: A) Amitriptyline B) Octreotide C) Gluten-free diet D) Methysergide maleate Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.