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: Surgery
Which of the following does not suggest postoperative infection? 
Select and explain. 
A. Increase in temperature, B. Swelling, C. Pain, D. Pitting edema
D: Pitting edema
Answer: D: Pitting edema 
Explanation: None