A nurse is caring for a patient who attacked a friend and is now admitted to the psychiatric unit. Which of the following actions should the nurse take first? Which action should the nurse take first for an aggressive patient?

The correct answer is C: Set behavioral limits for the patient. This is the first action the nurse should take to ensure the safety of the patient and others. By setting clear boundaries and limits, the nurse can help manage the patient's aggressive behavior and prevent any further harm. Establishing a patient relationship (A) is important but secondary to ensuring immediate safety. Exploring the truth of the patient's statements (B) can be addressed once the aggressive behavior is under control. Explaining to the patient that the behavior was unacceptable (D) may not be effective in the heat of the moment and should come after setting limits.