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
The least effect on the prognosis of a periodontal disease is 
Select and explain. 
A. Suppuration from the pocket, B. Furcation involvement, C. Alveolar bone loss, D. Co-operation and motivation of the patient
A: Suppuration from the pocket
Answer: A: Suppuration from the pocket 
Explanation: None