Lactose is the component of milk that helps regulate crust color during baking. Lactose, when heated, caramelizes and contributes to the browning of the crust.
- Glucose and Sucrose also play a role in browning but are not the primary sugars in milk.
- Maltose is a sugar formed during the breakdown of starch, but it is not the key player in milk crust color.
Thus, the correct answer is Lactose.