Correct Answer: C

Rationale: Insulin glargine is classified as a long-acting insulin. It is designed to provide a consistent level of insulin over approximately 24 hours, helping to keep blood glucose levels stable throughout the day. This long duration of action makes it suitable for basal insulin replacement in patients with type 1 diabetes, providing a background level of insulin to mimic the body's natural release of insulin between meals and overnight.

Correct Answer: C

Rationale: Erythropoietin primarily stimulates the bone marrow to produce more red blood cells, which helps to improve oxygen delivery to tissues. In chronic kidney disease, patients often develop anemia due to reduced erythropoietin production by the kidneys. By administering exogenous erythropoietin, the deficient hormone is replaced, leading to an increase in red blood cell production and subsequently improving the oxygen-carrying capacity of the blood.

Correct Answer: B

Rationale: The correct answer is B: Liver toxicity. Valproic acid is known to potentially cause liver toxicity. Monitoring liver function tests regularly in patients taking valproic acid is crucial to detect any signs of liver damage early and prevent serious complications.

Correct Answer: C

Rationale: The correct instruction for administering alendronate to a patient with osteoporosis is to take the medication with a full glass of water first thing in the morning. It is important for the patient to remain upright for at least 30 minutes after taking the medication to prevent esophageal irritation. Taking alendronate with milk, lying down after intake, or taking it before bedtime can reduce the medication's effectiveness or increase the risk of side effects.

Correct Answer: D

Rationale: Alprazolam is a benzodiazepine that primarily works by reducing anxiety. It achieves this by enhancing the inhibitory effects of the neurotransmitter GABA in the brain, which leads to a calming effect on the individual. Therefore, the primary action of alprazolam is to decrease anxiety levels rather than increase energy, induce sedation, or elevate mood.