Correct Answer: D

Rationale: The correct answer is D, 'Rash in the mouth.' Smallpox presents with a distinctive rash that typically begins in the mouth and spreads to the rest of the body, developing into pustules. This rash is a key clinical manifestation of smallpox. This infectious disease is characterized by the rash, fever, and other systemic symptoms. Choices A, B, and C are incorrect because they are not associated with smallpox. Bloody diarrhea, ptosis of the eyelids, and descending paralysis are not typical clinical manifestations of smallpox.

Correct Answer: B

Rationale: A PaCO2 level of 55 mm Hg indicates hypercapnia, which is common in clients with emphysema but may require further treatment if it leads to respiratory acidosis or distress. Elevated PaCO2 levels can indicate inadequate ventilation and impaired gas exchange, potentially leading to respiratory acidosis. The other results fall within normal ranges or compensated values for a client with chronic emphysema and do not necessarily indicate the need for immediate intervention.

Correct Answer: A

Rationale: The correct answer is A. Troponin I is a specific marker for myocardial infarction, and levels of 8 ng/mL are elevated, indicating heart muscle damage. Brain natriuretic peptide (BNP) is more related to heart failure rather than myocardial infarction, making choice B incorrect. Alanine aminotransferase (ALT) is a liver enzyme and not specific to myocardial infarction, so choice C is incorrect. High-density lipoprotein (HDL) is a type of cholesterol and is not typically used to diagnose or monitor myocardial infarction, making choice D incorrect.

Correct Answer: D

Rationale: The correct answer is to leave one side rail up on the client's bed. This action can help prevent falls while allowing the client to get up safely when needed, reducing the risk of injury from wandering. Placing the client in seclusion (Choice A) is not appropriate as it can lead to increased agitation and distress. Requesting restraints (Choice B) should be avoided as it can increase the risk of injuries and is not recommended for clients with Alzheimer's. Dimming the lighting (Choice C) may increase confusion and disorientation in clients with Alzheimer's disease.

Correct Answer: B

Rationale: The correct answer is B. Grapefruit juice can increase the risk of toxicity with simvastatin, so clients should avoid consuming it while on the medication. Choice A is incorrect because the timing of medication administration should be based on healthcare provider instructions. Choice C is incorrect because simvastatin is prescribed to lower cholesterol levels. Choice D is incorrect as monitoring kidney function is not specifically related to simvastatin therapy.