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
Typhoid carriers harbor bacteria in 
Select and explain. 
A. Gallbladder, B. Urinary bladder, C. Pancreas, D. Spleen
A: Gallbladder
Answer: A: Gallbladder 
Explanation: 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