Correct Answer: A

Rationale: The correct answer is Anthrax. Anthrax is a high-risk bioterrorism agent because it can be readily transmitted through multiple portals of entry such as inhalation, ingestion, or skin contact. This makes it a significant concern for use as a biological weapon. Smallpox, though highly contagious, is not known for multiple portals of entry like Anthrax. Botulism is a potent toxin but is not as easily transmissible through various routes as Anthrax. Tularemia, while a serious bacterial infection, does not have the same ease of transmission through multiple portals of entry as Anthrax.

Correct Answer: B

Rationale: PCA allows patients to self-administer pain medication within prescribed limits, without the need to call the nurse before taking an additional dose. Choice B suggests a misunderstanding of how PCA works, as the patient should be educated that they can self-administer doses within the safety parameters set by the healthcare provider. Choices A, C, and D demonstrate proper understanding of PCA, hence are not indicative of needing further teaching.

Correct Answer: B

Rationale: In situations where a client is trembling and fearful upon admission to a psychiatric unit, it is essential to prioritize building trust and reducing anxiety. By introducing oneself and accompanying the client to their room, the nurse can establish a therapeutic relationship, provide a sense of security, and address the client's immediate emotional needs. Choices A, C, and D are not the most appropriate initial responses as they do not directly address the client's emotional state or focus on establishing a supportive relationship.

Correct Answer: B

Rationale: The continuum health model emphasizes ongoing health practices based on past behaviors. Choice A is incorrect as it describes a more binary approach to health. Choice C is incorrect as it focuses on alternative therapies rather than the continuity of health practices.

Correct Answer: D

Rationale: The correct answer is D, physical therapy. Tertiary prevention focuses on rehabilitation and treatment to prevent complications from a disease or injury. Physical therapy falls under this category as it helps individuals recover and improve functionality after an illness or injury. Choices A, B, and C are not examples of tertiary prevention. Health education (choice A) is more aligned with primary prevention by promoting healthy behaviors to prevent disease onset. Regular exercise (choice B) can be categorized under both primary and secondary prevention as it aims to prevent disease development and detect conditions early. Screening tests (choice C) are part of secondary prevention as they aim to detect diseases at an early stage for prompt treatment.