Correct Answer: B

Rationale: The best dietary advice for a patient with iron-deficiency anemia is to increase vitamin C intake. Vitamin C enhances the absorption of non-heme iron, which can help improve iron-deficiency anemia. Choices A, C, and D are not the best options for this condition. Increasing dairy consumption (Choice A) may not directly address the iron deficiency. Reducing red meat consumption (Choice C) may limit heme iron intake, which is easily absorbed by the body. Increasing fiber intake (Choice D) is generally beneficial but is not specifically recommended as the top advice for iron-deficiency anemia.

Correct Answer: B

Rationale: Iron deficiency is the most common nutrient deficiency globally. It leads to anemia and affects many populations, especially women and children. Magnesium, selenium, and zinc deficiencies are important, but they are not as prevalent as iron deficiency on a global scale.

Correct Answer: C

Rationale: The correct answer is C. DRIs are intended for the general population and do not specifically address disease states, which are managed with different clinical guidelines. Choice A is correct as DRIs have replaced the older recommended daily allowances. Choice B is correct as current DRIs aim to estimate the required nutrients for long-term health. Choice D is correct as DRIs also attempt to establish maximum safe levels of tolerance for nutrients.

Correct Answer: C

Rationale: The correct answer is Vitamin B3, also known as Niacin. Niacin is essential for energy metabolism and can help improve cholesterol levels. Vitamin B1 is Thiamine, Vitamin B2 is Riboflavin, and Vitamin B12 is Cobalamin. These vitamins have different functions in the body and are not synonymous with Niacin.

Correct Answer: D

Rationale: Leg cramps are a common complication during hemodialysis due to shifts in fluid and electrolyte levels that occur during the treatment. Confusion (choice A) is not a common complication specifically related to hemodialysis. Profuse sweating (choice B) is not typically associated with hemodialysis complications. Hypertension (choice C) might be a pre-existing condition in some patients but is not a direct common complication of hemodialysis.