The correct option is A Molisch's test
a) Molisch's test is used to detect the presence of carbohydrates.
b) Biuret test is used for the detection of peptide bonds.
c) When ninhydrin reagent is added to the solution, the colourless solution changes to blue purple or pink depending on the nature of the amino acid.
d) Millon's test is used for the detection of amino acids containing phenolic groups (Tyrosine).