Fehling’s solution ‘A’ is:

Fehling's reagent consists of two solutions:Fehling’s A: Aqueous solution of copper(II) sulfate (${\text{CuSO}}_4\cdot 5{\text{H}}_2\text{O}$).Fehling’s B: Alkaline solution of sodium potassium tartrate (Rochelle salt).When mixed, they form a deep blue complex.