Sentence:  Says Wallace F. Jannsen , director of the FDA 's Division of Public Information : `` <WSD>Quacks</WSD> are apt to direct their appeal directly to older people , or to sufferers from chronic ailments such as arthritis , rheumatism , diabetes , and cancer . 
Meaning of the word marked with <WSD> tags:  an untrained person who pretends to be a physician and who dispenses medical advice