Correct Answer: D

Rationale: The correct answer is D. Whitish oval specks sticking to the hair shaft are nits, which are a definitive sign of pediculosis capitis (head lice). A: Scratching the head more than usual is a common symptom but not confirmatory of head lice infestation. B: Flakes evident on a student's shoulders may indicate dandruff or dry scalp, not necessarily head lice. C: Oval pattern occipital hair loss is not a typical manifestation of pediculosis capitis.

Correct Answer: A

Rationale: The correct initial response in CPR is to confirm unresponsiveness. This step is crucial to ensure that the person actually needs CPR before proceeding with further actions. Checking for unresponsiveness is essential to determine if the individual is in need of immediate assistance. Checking for a pulse or beginning chest compressions without confirming unresponsiveness could waste valuable time and potentially harm the individual. Calling for emergency help is important, but it should follow the confirmation of unresponsiveness to ensure timely activation of emergency services.

Correct Answer: B

Rationale: The correct action for the nurse to take is to give information about advance directives to the client. By providing this information, the nurse empowers the client to make an informed decision about their care preferences. Choice A is incorrect because simply recording the lack of advance directive does not address the client's need for information. Choice C is incorrect because assuming the client wishes a full code without discussing it with them is not appropriate and may not align with the client's wishes. Choice D is incorrect as the nurse should directly address the issue with the client rather than involving another staff member.

Correct Answer: D

Rationale: Crackles in the lungs are concerning because they indicate pulmonary congestion, a serious complication of congestive heart failure. The presence of crackles suggests fluid accumulation in the lungs, requiring immediate attention to prevent respiratory distress and worsening heart failure. While shortness of breath on exertion, weight gain, and orthopnea are common signs and symptoms of heart failure, crackles specifically point to acute pulmonary edema or worsening congestion, making them the most concerning finding in this scenario.

Correct Answer: A

Rationale: Crohn's disease is known to impair calcium absorption, which can lead to hypocalcemia. This condition affects the intestines and can disrupt the normal absorption of nutrients, including calcium. Postoperative status following appendectomy, history of bone cancer, and hyperthyroidism are typically not directly associated with a higher risk of developing hypocalcemia compared to Crohn's disease.