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 Toll-like receptor is most specific for bacterial recognition? 
Select and explain. 
A. TLR-1, B. TLR-2, C. TLR-3, D. TLR-4
D: TLR-4
Answer: D: TLR-4 
Explanation: Lipopolysaccharide is an integral part of Gram negative bacterial cell wall.