What is lactose? 
Lactose is made up of glucose and galactose. (2) 
Lactose is a type of disacccharide.

People that are lactose intolerant cannot digest this lactose properly. (2)

What contains lactose? 
Lactose comes primarily from milk and other dairy products. (1)

Resources
1. https://www.delightedcooking.com/what-are-simple-carbohydrates.htm
2. https://www.verywellfit.com/what-are-simple-carbohydrates-2506880

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