1. What is the mechanism of action of a beta-blocker? A. Inhibition of cyclooxygenase B. Blockade of beta-adrenergic receptors C. Activation of dopamine receptors D. Inhibition of angiotensin-converting enzyme Answer: B. Blockade of beta-adrenergic receptors Rationale: Beta-blockers work by blocking the effects of adrenaline on the beta-adrenergic receptors, which reduces heart rate and blood pressure. 2. Which of the following medications is indicated for the treatment of depression? A. Amoxicillin B. Citalopram C. Atorvastatin D. Omeprazole Answer: B. Citalopram Rationale: Citalopram is a selective serotonin reuptake inhibitor (SSRI) commonly prescribed for the treatment of depression. 3. True or False: Aspirin is contraindicated in patients with a history of peptic ulcers. Answer: True Rationale: Aspiri