A 49-year-old man comes to the physician for a follow-up appointment. Stool is positive for staining with Oil Red O and Sudan Black. Laboratory studies show direct bilirubin, ALP, amylase, and lipase within the normal range.

Which of the following is the most likely explanation for this patient’s findings?
A) Acute cholecystitis
B) Chronic cholecystitis
C) Acute pancreatitis
D) Chronic pancreatitis
E) Porcelain gallbladder
