Correct Answer: A

Rationale: Elevated troponin levels are the most specific and sensitive indicator of myocardial infarction. Troponin levels increase within hours of an MI and remain elevated for several days.

Correct Answer: B

Rationale: Leukopenia, or a low white blood cell count, is a critical concern in clients undergoing radiation therapy due to increased risk of infection.

Correct Answer: D

Rationale: Tetanus causes severe muscle spasms and sensitivity to stimuli, so minimizing stimuli like light, sound, and touch can help prevent painful spasms. Monitoring vital signs and administering antibiotics are important but managing stimuli is crucial for the child's comfort and safety.

Correct Answer: C

Rationale: Antibiotics must be taken for the entire prescribed duration to ensure that the infection is completely eradicated. Stopping antibiotics early, even if symptoms improve, can lead to a recurrence of the infection or antibiotic resistance.

Correct Answer: B

Rationale: A neurological assessment is the priority when a stroke is suspected to determine the extent of brain injury and identify any immediate risks, such as impaired airway, speech deficits, or loss of motor function. Early recognition of these signs is essential for timely intervention and to guide further treatment like the administration of tPA, if appropriate.