This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
[{'content': 'Typhoid carriers harbor bacteria in \nSelect and explain. \nA. Gallbladder, B. Urinary bladder, C. Pancreas, D. Spleen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Salmonella typhi or Salmonella typhimurium can infect the gallbladder. Acute cholecystitis can occur. More frequently, chronic cholecystitis occurs, the patient becoming a typhoid carrier excreting the bacteria in the bile.Ref: Bailey and love 27e pg: 1202', 'role': 'assistant'}]