The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 34-year-old woman with poorly controlled Crohn disease comes to the physician because of a 2-week history of hair loss and a rash on her face. She has also noticed that food has recently tasted bland to her. She had to undergo segmental small bowel resection several times because of intestinal obstruction and fistula formation. Examination shows several bullous, erythematous perioral plaques. There are two well-circumscribed circular patches of hair loss on the scalp. A deficiency of which of the following is the most likely cause of this patient's condition?   (A) Niacin   (B) Cobalamin   (C) Iron   (D) Zinc
['(D) Zinc <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Niacin \n (B) Cobalamin \n (C) Iron \n (D) Zinc <> possible answers', "  A 34-year-old woman with poorly controlled Crohn disease comes to the physician because of a 2-week history of hair loss and a rash on her face. She has also noticed that food has recently tasted bland to her. She had to undergo segmental small bowel resection several times because of intestinal obstruction and fistula formation. Examination shows several bullous, erythematous perioral plaques. There are two well-circumscribed circular patches of hair loss on the scalp. A deficiency of which of the following is the most likely cause of this patient's condition? <> context@"]