Correct Answer: A

Rationale: The bioethical issue described in option A revolves around the concept of advance directives. Advance directives are legal documents that outline a person's wishes regarding medical treatment in the event that they are unable to communicate those wishes themselves. In this scenario, the issue pertains to the withholding of food and treatment based on a written advance directive that was made before the patient suffered permanent brain damage. This raises important ethical considerations about respecting a patient's autonomy and adhering to their previously expressed wishes, even in difficult circumstances. The decision to withhold treatment in such a situation is a complex bioethical issue that needs to be handled carefully while balancing the principles of autonomy and beneficence.

Correct Answer: B

Rationale: Bulimia nervosa is best defined as a pathological disorder involving recurrent episodes of binge eating followed by inappropriate compensatory behaviors to prevent weight gain, such as self-induced vomiting, excessive exercise, or misuse of laxatives. It is categorized as an eating disorder rather than a phobic disorder as it involves behaviors related to food consumption and body image, not just fears or phobias. Bulimia is not solely associated with starving oneself, as individuals with bulimia tend to consume large amounts of food during binge episodes. Therefore, the most accurate definition of bulimia is a pathological disorder of binging and vomiting.

Correct Answer: C

Rationale: Breach of duty is the element of malpractice that occurs when the nurse does not act as a reasonable, prudent person would have acted in a similar circumstance. This means that the nurse failed to uphold the standard of care expected in their practice. In a malpractice case, it must be proven that the nurse breached their duty of care towards the patient by not providing the expected level of skill and care that another reasonable nurse in the same situation would have provided.

Correct Answer: A

Rationale: Opsonization refers to the process by which antibodies bind to the surface of pathogens, marking them for destruction by phagocytes or complement proteins. This coating of antibodies enhances the ability of the immune system to recognize and eliminate the pathogens effectively. Phagocytes (such as macrophages and neutrophils) are better able to engulf and digest pathogens that have been opsonized, as the antibodies attached to the pathogen surface signal to the phagocytes that they are foreign invaders. This process is crucial in the body's immune response to infections and helps in clearing pathogens from the system.

Correct Answer: B

Rationale: Nurses are bound by strict confidentiality and privacy regulations in their profession. If a nurse fails to keep a patient's personal information confidential and discloses it without authorization, they can be charged with invasion of privacy. Invasion of privacy is the wrongful intrusion into a person's private affairs without their consent, and it is a serious violation of ethical and legal standards in healthcare. Nurses must always prioritize patient confidentiality to maintain trust and uphold ethical standards in their practice.