This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gallbladder, Subject name: Surgery
[{'content': 'Best treatment for the given type of cholecystitis is: \nSelect and explain. \nA. Urgent cholecystectomy or cholecystostomy under antibiotic coverage, B. Conservative management followed by interval cholecystectomy, C. Conservative treatment and treat primary cause like DM, D. Urgent ERCP', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In X-Ray, GB shows presence of air, that gives the diagnosis of emphysematous cholecystitis. M.C organism responsible for emphysematous cholecystitis is clostridium perfringens (anaerobe). M.C aerobic organism responsible is E. coli. - Cause of Xanthogranulomatous cholecystitis ( non -infectious condition)- rupture of Rokitansky-Aschoff sinuses. Investigation of choice: NCCT. Rx: Urgent cholecystectomy or cholecystostomy + antibiotics.', 'role': 'assistant'}]