Correct Answer: D

Rationale: When an individual turns 18, they are considered a legal adult and have the right to privacy regarding their medical information. Therefore, the nurse should explain to the mother that without the 18-year-old's permission, the results cannot be disclosed.

Correct Answer: A

Rationale: The correct answer is A. Duchenne muscular dystrophy is an inherited X-linked recessive disorder that primarily affects male children in the family. Since it is X-linked, sons inherit the mutation from their mothers who are carriers of the abnormal gene. Therefore, the nurse should explain to the parents that any future sons they have would have a 50% chance of inheriting the mutation and having DMD, while daughters would have a 50% chance of being carriers like the mother.

Correct Answer: B

Rationale: In nephrotic syndrome treatment, decreased periorbital edema is a positive therapeutic response as it indicates a reduction in fluid retention. Periorbital edema is a common symptom of nephrotic syndrome due to fluid accumulation, so a decrease in this swelling signifies an improvement in the condition.

Correct Answer: C

Rationale: Using a barrier cream like zinc oxide forms a protective layer on the skin, creating a barrier against irritants and moisture, thus helping to prevent diaper rash. Unlike other options, barrier creams do not need to be completely removed at each diaper change, allowing the skin to remain protected between changes.

Correct Answer: A

Rationale: Tachycardia is a common early sign of dehydration in infants. It is important for healthcare providers to be vigilant in monitoring infants with these symptoms, as prompt intervention is crucial to prevent further complications.