<prompt> Million-Nasses reaction is specific for the amino acid:TryptophanTyrosinePhenylalanineArginine  <response>: Millons Test: The phenol group of phenylalanine and tyrosine containing proteins, when heated with mercuric sulfate in sulfuric acidand sodium nitrite or, mercurous and mercuric nitrates in nitric acid form red colored mercury phenolate.Reference: Vasudevan 7th ed, pg 31 