Correct Answer: B

Rationale: Rotating injection sites when administering insulin helps prevent insulin lipodystrophy, which is the abnormal distribution of fat at injection sites. Insulin edema (choice A) is not prevented by rotating injection sites; it is characterized by swelling at the site of insulin injection due to increased capillary permeability. Insulin resistance (choice C) is a condition where the body's cells become less responsive to insulin, and rotating injection sites does not directly prevent this. Systemic allergic reactions (choice D) are not specifically prevented by rotating injection sites; they are related to an allergic response to insulin.

Correct Answer: D

Rationale: The correct order of the six levels of consciousness from most to least responsive is Alert, Confused, Lethargic, Obtunded, Stuporous, Comatose. Choice A is incorrect because it starts with Obtunded, which is less responsive than Alert. Choice B is incorrect as it doesn't follow the correct order. Choice C is incorrect as Lethargic is more responsive than Obtunded. Therefore, the correct answer is D.

Correct Answer: A

Rationale: The correct answer is A: "The use of oral contraceptives." Risk factors for deep vein thrombosis include factors such as immobility, surgery, cancer, obesity, smoking, and the use of oral contraceptives. Choices B, C, and D are incorrect because blood type and Rh factor do not play a role in the development of deep vein thrombosis, and being underweight is not typically considered a risk factor for this condition.

Correct Answer: D

Rationale: The signs and symptoms described point towards rheumatoid arthritis. Erythema marginatum, Sydenham chorea, epistaxis, abdominal pain, fever, cardiac issues, and skin nodules are classic manifestations of rheumatic fever, which is a complication of untreated streptococcal infection. This condition can lead to rheumatoid arthritis over time. Choices A, B, and C are incorrect as they do not align with the provided signs and symptoms, and they are not associated with the clinical presentation described.

Correct Answer: B

Rationale: The correct answer is B. A bivalve cast can help decrease the risk of compartment syndrome by providing space for swelling, thus preventing the build-up of pressure within the muscles. Choices A, C, and D are incorrect because they are not directly related to preventing compartment syndrome. Choice A is more focused on managing heart failure, choice C on reducing intracranial pressure, and choice D on restoring intrathoracic pressure after a pneumothorax, which are not relevant to preventing compartment syndrome.