A 45-year-old presents with episodic right upper quadrant pain after fatty meals, nausea, and Murphy's sign on exam. Ultrasound shows gallstones with a thickened gallbladder wall. What is the most appropriate next step?
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A
Laparoscopic cholecystectomy
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B
ERCP with sphincterotomy
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C
Ursodeoxycholic acid therapy
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D
IV antibiotics and watchful waiting