Correct Answer: D

Rationale: The correct answer is D: Call in additional medical-surgical unit nursing care staff. In a mass casualty event, there is a sudden surge of patients requiring immediate medical attention. Calling in additional nursing staff ensures that there are enough healthcare providers to manage the increased workload and provide timely care to all patients. This action helps maintain patient safety and quality of care during a crisis.

Incorrect options:
A: Recommending specific acute care clients for discharge is not appropriate during a mass casualty event as all patients may require urgent care.
B: Determining the medical needs of incoming clients through the emergency department may delay the necessary response in a mass casualty situation.
C: Acting as a liaison between the facility and the media is not a priority during a mass casualty event and can divert attention from patient care.

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