This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Limulus amoebocyte lysate assay is used for the detection of 
Select and explain. 
A. Exotoxin, B. Endotoxin, C. Preformed toxin, D. None
B: Endotoxin
Answer: B: Endotoxin 
Explanation: Limulus amebocyte lysate (LAL) is an aqueous extract of blood cells (amoebocytes) from the Atlantic horseshoe crab, Limulus polyphemus. LAL reacts with bacterial endotoxin lipopolysaccharide (LPS), which is a membrane component of gram-negative bacteria.LAL test is widely used for the detection and quantification of bacterial endotoxins. Ref: Ananthanaryanan 9th ed pg 78