Sentence:  Dr. Wilson C. Grant , of the Veterans ' Administration Hospital , Coral Gables , Florida , and the University of Miami School of Medicine , set out to discover if avocados , because of their high content of unsaturated fatty acids , would reduce the <WSD>cholesterol</WSD> of the blood in selected patients . 
Meaning of the word marked with <WSD> tags:  an animal sterol that is normally synthesized by the liver; the most abundant steroid in animal tissues