A 63-year-old woman has nausea, vomiting, shaking chills, fever and abdominal pain of 4 hours’ duration. Physical examination reveals a temperature of 39.2 C, scleral icterus, and epigastric tenderness. Ultrasonography of the abdomen reveals gallstones and dilatation of the common bile duct. The liver and pancreas appears to be normal. Which of the following is the most likely diagnosis?