Which of the following compounds is identified by the 'Molisch test'?

$A$ sugar '$X$' dehydrates very slowly under acidic conditions to give furfural,which on further reaction with resorcinol gives a coloured product after some time. Sugar '$X$' is

$D(+)$-glucose reacts with hydroxylamine $(NH_2OH)$ and yields an oxime. The structure of the oxime would be:

Carbohydrates are stored in the human body as

The disaccharide present in milk is

An example of a disaccharide made up of two units of the same monosaccharides is