When Lactulose (Cephulac)30 ML Four Times Per Day Is Ordered

When lactulose (Cephulac) 30 mL four times per day is ordered for a patient with advanced cirrhosis,he complains that it causes diarrhea.The nurse explains to the patient that it is still important for him to take the drug because the drug will create which of the following actions?

A) Promote fluid loss
B) Prevent constipation
C) Prevent gastrointestinal (GI) bleeding
D) Improve nervous system function