Correct Answer: D

Rationale: The correct answer is D because a brain abscess can be caused by direct invasion of the brain, spread of infection by other organs, and spread of infection from nearby sites. Direct invasion can occur from trauma or surgery, while infections from other organs like the lungs or heart can travel through the bloodstream to the brain. Infections from nearby sites such as the sinuses or ears can also spread to the brain. Therefore, all of these mechanisms can lead to the formation of a brain abscess. Choices A, B, and C alone do not encompass all the possible causes of a brain abscess, making D the correct comprehensive answer.

Correct Answer: B

Rationale: The correct answer is B: Do not stop medication abruptly. Abruptly stopping propranolol can lead to rebound hypertension and potentially life-threatening complications. The nurse should emphasize the importance of gradual tapering under medical supervision to avoid adverse effects. A: Having potassium levels checked is not directly related to propranolol use for hypertension management. C: Changes in appetite are not specific to propranolol use and may not be a significant concern compared to abrupt cessation of the medication. D: Resuming usual daily activities is important but not as crucial as the correct instruction to avoid abrupt discontinuation of propranolol.

Correct Answer: A

Rationale: The correct answer is A: Citrus fruits and green leafy vegetables. Citrus fruits and green leafy vegetables are good sources of Vitamin C and iron, which are essential for individuals with iron deficiency anemia. Vitamin C enhances the absorption of iron from plant-based sources, while green leafy vegetables provide iron. Bananas and nuts (choice B) are not significant sources of iron. Coffee and tea (choice C) can inhibit iron absorption. Dairy products (choice D) are not high in iron and can also inhibit iron absorption. Therefore, choosing citrus fruits and green leafy vegetables indicates understanding of the dietary instructions for managing iron deficiency anemia.

Correct Answer: A

Rationale: The correct answer is A because exercising the bitten extremity can increase the spread of the venom. Choice B is correct as poisonous snake bites typically leave two fang marks. Choice C is correct as immediate severe pain and swelling are common symptoms of a poisonous snake bite. Choice D is incorrect as a tourniquet should not be used for snake bites as it can lead to complications such as tissue damage and increased risk of infection.

Correct Answer: A

Rationale: The correct answer is A: Decreased resistance to infection. Lymphocytes are a crucial part of the immune system, responsible for fighting off infections. A decrease in the number of lymphocytes with age leads to a weakened immune response, making individuals more susceptible to infections. - Choice B: Cognitive problems, is not directly related to lymphocyte levels. - Choice C: Urinary incontinence, is not a typical effect of decreased lymphocytes. - Choice D: Decrease in various blood components, is too broad and not specific to the role of lymphocytes in immunity.