This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Patients receiving fluid replacement therapy should be frequently monitored for: 
Select and explain. 
A. Adequate urinary output, B. Changes in mental status, C. Vital sign stability, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: The nurse must monitor for adequate urinary output, changes in mental status, and vital sign stability because these factors are directly influenced by fluid replacement therapy.

Option A: Urinary output should be monitored because an effective fluid replacement therapy is manifested by adequate urine output.
Option B: Fluid replacement therapy affects the mental status of the patient directly.
Option C: Vital sign stability could be achieved through an effective fluid replacement therapy