Correct Answer: A

Rationale: The correct answer is to check the client's digoxin level (Choice A). Nausea can be a sign of digoxin toxicity, so assessing the digoxin level is crucial to determine if the medication dosage needs adjustment. Continuing the current dose of digoxin (Choice B) may worsen the symptoms if toxicity is present. Administering an antiemetic (Choice C) may provide temporary relief but does not address the underlying issue of digoxin toxicity. Discontinuing digoxin immediately (Choice D) without assessing the digoxin level can be harmful if the medication is within the therapeutic range.

Correct Answer: A

Rationale: The correct answer is A: Autoimmune disease. Autoimmune diseases occur when the body's immune system mistakenly attacks its own tissues, leading to inflammation and damage. This is different from infectious diseases (choice B), which are caused by pathogenic microorganisms, allergic reactions (choice C), which involve an exaggerated response of the immune system to harmless substances, and degenerative diseases (choice D), which are characterized by progressive deterioration of tissue or organs due to various factors.

Correct Answer: A

Rationale: The correct answer is to avoid foods high in potassium. Spironolactone is a potassium-sparing diuretic, meaning it helps the body retain potassium and can lead to hyperkalemia if too much potassium is consumed. Choices B, C, and D are incorrect because increasing intake of potassium-rich foods can worsen hyperkalemia, while avoiding foods high in sodium is not the primary concern when taking spironolactone.

Correct Answer: A

Rationale: The correct answer is A, Pulmonary fibrosis. Pulmonary fibrosis is a lung disease where lung tissue is damaged and scarred, resulting in breathing difficulties and decreased oxygen transfer into the bloodstream. Cystic fibrosis (B) is a genetic disorder primarily affecting the lungs and digestive system, not causing lung scarring. COPD (C) includes conditions like chronic bronchitis and emphysema but doesn't specifically involve lung scarring. Tuberculosis (D) is a bacterial infection that primarily affects the lungs but doesn't cause lung tissue scarring and stiffness as seen in pulmonary fibrosis.

Correct Answer: A

Rationale: The correct answer is A: Endocardium, Myocardium, Epicardium. The heart consists of three main layers: the endocardium, which lines the inner chambers of the heart; the myocardium, the middle layer responsible for the heart's pumping action; and the epicardium, the outermost layer that protects the heart. Choices B, C, and D are incorrect as they do not list the heart's layers in the correct order or combination.