“Cannizzaro reaction is base-induced disproportionation of two molecules of a non-ionizable aldehyde to yield a carboxylic acid and a primary alcohol. These reactions are those in which aldehyde having absence of $\alpha$- hydrogen atom on treatment with NaOH give oxidation and reduction products one of which is salt of carboxylic acid and other is alcohol. 

Hence, the correct answer is option (B) It is a reaction answered only aldehydes not containing $\alpha$- hydrogens.