Question: A 30-year-old woman presented with recurrent episodes of biliary colic for last 3 months. There was no history of fever, yellowish discoloration of eyes or urine, and weight loss. Clinical examination was normal. Laboratory investigations revealed the following: total leukocyte count, 6900/L; serum bilirubin, 2.0 mg/dL (normal, 0.2–1.0); aspartate aminotransferase, 87 U/L (normal, 5–50); alanine aminotransferase, 95 U/L (normal, 0–50); serum alkaline phosphatase, 220 U/L (normal, 25–125); serum amylase, 24 U (normal, 20–80); and serum lipase, 32 U/L (normal, 0–190).