A 59-year-old man with suspected acute cholecystitis presents with right upper quadrant pain, fever and leukocytosis. Ultrasound confirms gallstones and gallbladder wall thickening. What is the most appropriate initial management?AImmediate ERCPBConservative management with IV antibiotics, fluids and analgesia, followed by early laparoscopic cholecystectomyCOpen cholecystectomy as an emergency at night in all casesDNo antibiotics are requiredELong-term Ursodeoxycholic acid onlyCheck my answer