Which of the following carbohydrates is a disaccharide?

🔑Key Points:
Disaccharides-Two monosaccharides combine to form a disaccharide.
Examples of carbohydrates having two monomers include- Sucrose, Lactose, Maltose.
Sources of Carbohydrates
Simple sugars are found in the form of fructose in many fruits.
Galactose is present in all dairy products.
Lactose is abundantly found in milk and other dairy products.
Maltose is present in cereal, beer, potatoes, processed cheese, pasta, etc.
Sucrose is naturally obtained from sugar and honey containing small amounts of vitamins and minerals.

🔴🔴Additional Information:
Simple carbohydrates have one or two sugar molecules.
In simple carbohydrates, molecules are digested and converted quickly resulting in a rise in blood sugar levels. 
They are abundantly found in milk products, beer, fruits, refined sugars, candies, etc.
These carbohydrates are called empty calories, as they do not possess fibre, vitamins and minerals.
Plants, being producers, synthesize glucose (C6H12O6) using raw materials like carbon dioxide and water in the presence of sunlight.
This process of photosynthesis converts solar energy to chemical energy.
Consumers feed on plants and harvest energy stored in the bonds of the compounds synthesized by plants.
Monosaccharides-Glucose is an example of a carbohydrate monomer or monosaccharide. Other examples of monosaccharides include mannose, galactose, fructose, etc. 
Disaccharides-Two monosaccharides combine to form a disaccharide. Examples of carbohydrates having two monomers include- Sucrose, Lactose, Maltose,
Oligosaccharides-Carbohydrates formed by the condensation of 2-9 monomers is called oligosaccharides. By this convention, trioses, pentoses, hexoses are all oligosaccharides.