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: The priority intervention for a 5-year-old child with leukemia receiving chemotherapy and having a low white blood cell count is to place the child in protective isolation. This intervention helps reduce the risk of infection, which is crucial in this immunocompromised state. Protective isolation aims to limit the child's exposure to pathogens and promote their safety during a period of increased vulnerability to infections.

Correct Answer: A

Rationale: Using a peak flow meter daily is crucial as it helps monitor asthma control by measuring how well the child's lungs are functioning. This monitoring can indicate when intervention is needed before symptoms worsen or become severe, allowing for timely management of asthma exacerbations.

Correct Answer: A

Rationale: The practical nurse should suggest playing peek-a-boo to the parents of a 7-month-old infant to encourage visual stimulation. Peek-a-boo is a suitable game for this age group as it helps develop visual tracking skills and the concept of object permanence. By covering and uncovering their face or a toy, the infant learns that things still exist even when they cannot be seen, promoting cognitive development and visual engagement.

Correct Answer: B

Rationale: During a grand mal seizure, the priority action for the nurse is to ensure the safety of the client. Observing the client carefully allows the nurse to monitor the seizure activity, the client's breathing, and any signs of distress without interfering with the seizure process. Restraining the client or placing objects in the mouth can lead to injury and should be avoided. Calling a CODE is not appropriate for a seizure as it is a normal response to the client's condition.