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: When collecting a mid-stream clean catch urine specimen for urine analysis, it is important to collect an adequate amount of urine for accurate testing. A volume of 30 to 60 ml is usually recommended for optimal results, so collecting only 5 to 10 ml would not provide enough urine for testing purposes. It is essential to follow proper collection techniques to ensure accurate and reliable test results.

Correct Answer: D

Rationale: The correct action for the nurse to take is to administer the Coumadin along with the heparin drip as ordered. Heparin and warfarin are often given together initially because warfarin takes a few days to become effective. Discontinuing the heparin drip prior to initiating Coumadin could leave the patient without anticoagulation coverage during the period when warfarin's effects are not yet established. Checking the client's INR prior to beginning Coumadin is important but not the immediate action to take when both medications are ordered together. Clarifying the order with the health care provider is unnecessary in this scenario as it is common practice to give heparin and warfarin concurrently in the transition period.

Correct Answer: B

Rationale: Clients who smoke require more vitamin C due to increased oxidative stress and depletion of vitamin C. Smoking leads to higher levels of oxidative stress in the body, which in turn increases the utilization of vitamin C to counteract the damage caused by free radicals. Choices A, C, and D do not directly impact the body's need for vitamin C as smoking does.

Correct Answer: B

Rationale: During an acute flare-up of diverticulitis, a low-residue diet is recommended. This diet helps reduce bowel movements and minimizes irritants in the colon, which can help alleviate symptoms and promote healing. High-fiber diets, like choice A, are typically recommended for diverticulosis prevention but may exacerbate symptoms during a flare-up due to increased bulk in the stool. Low-fat (choice C) and high-protein (choice D) diets are not specifically indicated for diverticulitis flare-ups.