This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Fever, leukopenia, DIC, and hypotension caused by members of the Enterobacteriaceae family are most strongly associated with which of the following structures? 
Select and explain. 
A. H antigens, B. K antigens, C. Lipid A, D. Polysaccharides
C: Lipid A
Answer: C: Lipid A 
Explanation: The lipopolysaccharide (LPS) of gram-negative cell walls consists of a complex lipid, lipid A, to which is attached a polysaccharide made up of a core and a terminal series of repeat units.