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: Pathology
Which intervention do you plan to include with a patient who has renal calculi? 
Select and explain. 
A. Maintain bed rest, B. Increase dietary purines, C. Restrict fluids, D. Strain all urine
D: Strain all urine
Answer: D: Strain all urine 
Explanation: All urine should be strained through gauze or a urine strainer to catch stones that are passed. The stones are then analyzed for composition.

Option A: Ambulation may help the movement of the stone down the urinary tract.
Option C: Encourage fluid to help flush the stones out.