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
Leukotoxin is released by: 
Select and explain. 
A. P. nucleatum, B. A. naeslundii, C. B. forsythna, D. A. actinomyctem comitans
D: A. actinomyctem comitans
Answer: D: A. actinomyctem comitans 
Explanation: None