Correct Answer: D

Rationale: The correct answer is D, Hypokalemia. Diuretics commonly lead to hypokalemia, which is low potassium levels in the body. Hyperkalemia (choice A) is the opposite, indicating high potassium levels. Hypercalcemia (choice B) refers to elevated calcium levels, not typically associated with diuretics. Hypomagnesemia (choice C) is low magnesium levels and can also be a consequence of diuretic use, but potassium imbalance is more common.

Correct Answer: D

Rationale: St. John's Wort is the correct answer because it can interact with antidepressants and oral contraceptives, potentially affecting their efficacy. Iron supplement, garlic, and green tea do not typically interact with antidepressants or oral contraceptives to the same extent as St. John's Wort.

Correct Answer: D

Rationale: The correct answer is D, St. John's Wort. St. John's Wort can interact with antidepressants and oral contraceptives, potentially reducing their efficacy. Iron supplement, garlic, and green tea are not typically known to have significant interactions with antidepressants or oral contraceptives, making them less likely to impact the client's treatment.

Correct Answer: A

Rationale: The correct answer is A. Turnips, radish, and horseradish are known to cause false-positive results in a Guaiac Test, which is used to detect blood in the stool. Avoiding these foods is crucial to ensure accurate test results. Choice B is incorrect because iron preparations can interfere with the test results. Choice C is incorrect as red meat does not impact the Guaiac Test significantly. Choice D is incorrect as caffeine and dark-colored foods are not relevant to the preparation for a Guaiac Test.

Correct Answer: B

Rationale: Clients who smoke require more vitamin C due to increased oxidative stress and depletion of vitamin C. Smoking leads to the generation of free radicals in the body, causing oxidative stress and consuming higher levels of antioxidants like vitamin C. Choices A, C, and D are incorrect as they do not directly relate to the increased need for vitamin C as seen in smokers.