The correct observation in the following reactions is:
$\text{Sucrose}$ $\xrightarrow[\text{Cleavage (Hydrolysis)}]{\text{Glycosidic bond}} A + B$ $\xrightarrow[\text{reagent}]{\text{Seliwanoff's}} ?$

• A
  Formation of blue colour
• B
  Formation of violet colour
• C
  Formation of red colour
• D
  Gives no colour