A 2-year-old presents with weight loss and chronic diarrhea for the last 3 months. Following physical examination and investigation, the physician finds that the diarrhea is caused by malabsorption syndrome. Which structure of the small intestine is most likely to be affected?

Anurse is caring for a client who has nicotine use disorder and asks about taking varenicline. the nurse should identify that which of the following conditions is a contraindication for this medication? a. rheumatoid arthritis b. copd c. anorexia nervosa d. major depressive disorder