Sentence:  Says Wallace F. Jannsen , director of the FDA 's Division of Public Information : `` Quacks are apt to direct their appeal directly to older people , or to sufferers from <WSD>chronic</WSD> ailments such as arthritis , rheumatism , diabetes , and cancer . 
Meaning of the word marked with <WSD> tags:  being long-lasting and recurrent or characterized by long suffering