<prompt> Keratinising metaplasia of salivary glands results due to deficiency ofVitamin AThiamineRiboflavinVitamin E  <response>: Vitamin A deficiency produces keratinizing metaplasia of the normally columnar ductal epithelium in the major and minor salivary glands.Ref : Handbook of Experimental Stomatology,edited by Samuel Dreizen, Barnet M. Levy. 