Correct Answer: D

Rationale: Patients taking Omeprazole should report black, tarry stools, diarrhea, or abdominal pain to the healthcare provider because these symptoms could indicate serious side effects associated with the medication.

Correct Answer: A

Rationale: Metoprolol, a beta-blocker, is contraindicated in clients with bradycardia as it can further lower the heart rate, potentially leading to more serious complications. Bradycardia is defined as a heart rate below 60 beats per minute and administering metoprolol in such cases can exacerbate this condition, causing adverse effects on cardiac output.

Correct Answer: B

Rationale: Using albuterol before cromolyn ensures the airways are open, allowing the maximum dose of medication to reach the lungs.

Correct Answer: D

Rationale: Metformin has dual actions by decreasing hepatic glucose production and intestinal glucose absorption, which helps in reducing blood glucose levels, and it also increases sensitivity to insulin, aiding in its proper utilization within the body. Therefore, the correct answer is D, as metformin performs both of these actions.

Correct Answer: C

Rationale: A decrease in hemoglobin A1C is a more specific indicator of metformin's effectiveness in controlling blood glucose levels over a longer period compared to fasting blood glucose levels. Hemoglobin A1C reflects average blood sugar levels over the past 2-3 months, providing a more comprehensive view of glycemic control.