Correct Answer: D

Rationale: Drugs ending in -tidine are histamine (H2) receptor antagonists, which block the action of histamine at the H2 receptors, commonly used to reduce stomach acid production. Therefore, the correct answer is an 'H antagonist.' It is essential to be familiar with drug suffixes as they can provide clues to the drug's class and function.

Correct Answer: C

Rationale: Calcium disodium ethylenediaminetetraacetic acid (CaEDTA) is the antidote for lead poisoning. CaEDTA works by chelating lead, forming a complex that is then excreted in the urine. It is used in chelation therapy to treat lead poisoning by reducing lead levels in the body.

Correct Answer: B

Rationale: Atenolol, a beta-blocker, is not typically associated with tachycardia. Instead, drug toxicity of Atenolol is more commonly linked to bradycardia due to its beta-blocking effects on the heart's electrical conduction system. Symptoms of Atenolol toxicity may include heart failure (CHF), AV block, and a sedative appearance, but not tachycardia.

Correct Answer: B

Rationale: Warfarin primarily affects the liver where it inhibits the synthesis of clotting factors.

Correct Answer: B

Rationale: Prednisone is not a common treatment for testicular cancer. Prednisone is used in conditions like Cushing's disease, lymphomas, and chronic leukemias due to its anti-inflammatory and immunosuppressive properties. However, testicular cancer treatment typically involves surgery, chemotherapy, and radiation therapy, but not Prednisone.