A 49-year-old woman with epigastric pain radiating to the back presents 12 hours after onset. Serum amylase is three times the upper limit of normal. Ultrasound shows gallstones. What is the most appropriate initial management?AAggressive intravenous fluid resuscitation and analgesiaBImmediate ERCP for all casesCStart prophylactic broad-spectrum antibiotics for all casesDDischarge home with oral analgesia onlyEImmediate cholecystectomy within 12 hours in all casesCheck my answer