The use of the antibiotic neomycin may decrease the absorption of:

Correct Answer: C

Rationale: The correct answer is C. Neomycin can interfere with the absorption of fat-soluble vitamins such as vitamins A, D, E, and K. Choice A is incorrect because neomycin does not affect the absorption of iron, copper, and zinc. Choice B is incorrect as neomycin does not impact the absorption of protein and amino acids. Choice D is also incorrect as neomycin does not decrease the absorption of water-soluble vitamins like vitamin C and the B vitamins.

Correct Answer: B

Rationale: A low-residue diet is the appropriate dietary recommendation for a patient with Crohn's disease experiencing diarrhea. This diet helps reduce bowel movements and manage diarrhea by limiting the intake of foods that are harder to digest. High-fiber diets (Choice A) may worsen diarrhea due to increased bulk in the stool. High-fat diets (Choice C) can be harder to digest and may exacerbate symptoms. High-protein diets (Choice D) are not specifically recommended for managing diarrhea in Crohn's disease.

Correct Answer: B

Rationale: A low-sodium diet is most recommended for patients with heart failure. This type of diet helps manage fluid retention by reducing the amount of sodium in the body, which in turn decreases the workload on the heart. High-sodium diets can lead to fluid retention and worsen heart failure symptoms. High-fat and low-carbohydrate diets are not specifically recommended for heart failure patients as the focus is primarily on controlling sodium intake.

Correct Answer: C

Rationale: Zinc supplementation is often used to manage mucositis in patients receiving chemotherapy. Zinc has been shown to aid in the healing process of mucositis. Vitamin E (Choice A) is not typically used to manage mucositis associated with chemotherapy. Vitamin B12 (Choice B) is essential for nerve function and the formation of red blood cells, but it is not primarily used to manage mucositis. Calcium (Choice D) is important for bone health and nerve function but is not specifically used to manage mucositis.

Correct Answer: A

Rationale: The best way to manage a patient's intake of dietary fiber is to increase it gradually. This approach helps prevent gastrointestinal discomfort that may arise from a sudden increase in fiber intake. Choice B is incorrect because increasing intake suddenly can lead to digestive issues. Choice C is incorrect as decreasing fiber intake abruptly may not be necessary and can impact overall health. Choice D is incorrect as maintaining a high intake without considering the patient's current intake level can also cause digestive problems.