Combine these 3 sentences to one sentence:
Milk products contain lactose.
Lactose is milk sugar.
Lacy is allergic to lactose.

Respuesta :

Lacy is allergic to things with milk sugar in it, milk products contains milk sugar so she cant have milk products. 
Lacy is allergic to lactose, lactose is milk sugar which is in milk products.
 ( hopefully this makes sense to youu)