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: Dental
Which of the following is not a clinical criterion to evaluate treatment outcome? 
Select and explain. 
A. Absence of a radiolucency, B. No evidence of a sinus tract, C. No swelling present, D. No response to percussion or palpation
A: Absence of a radiolucency
Answer: A: Absence of a radiolucency 
Explanation: Endodontic treatment outcome predictors using PA radiographs and CBCT imaging have been shown to vary and also are influenced by patient inclusion and exclusion criteria. Historically, PA radiographs and physical examinations were used to determine the success of endodontic treatment, and the absence of posttreatment periradicular radiolucencies and symptoms was considered the criterion for success.
The clinical criteria to evaluate treatment outcome may be:

No evidence of a sinus tract 
No swelling present 
No response to percussion or palpation 
Absence of a radiolucency may be a radiologic feature to evaluate the success of treatment.

Ref: Cohen pathways of Pulp 11th ed page no 56