<prompt> Exogenous pyrogen is?TNF-aLipopolysaccharideNeurotropic factorIL-6  <response>: Ans. is b i.e., Lipopolysaccharide Pyrogens may be exogenous or endogenousa Exogenous - Bacterial toxins eg: LPSb Endogenous-IL-1, TNF-a, IL-6, Interferons, Ciliorys neurotropic factor 