Although I was unable to find the multiple choices for the question, here is a simple, summarized explanation:
<u>Lactase</u> is an enzyme that is involved in breaking down lactose the sugar in milk. It is produced by a gene known as the LCT gene.
This enzyme is produced in the small intestine, and its main role is to digest a sugar called lactose, which is present in dairy products such as milk, and then transform it into simpler sugars - glucose and galactose -. This 'transformation' makes it easier for the body to absorb these sugars into the bloodstream and eventually turn them into energy.
