This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'Mercedes Benz sign or seagull sign is seen in \nSelect and explain. \nA. Gall stones, B. Renal stones, C. CBD stones, D. Hydatid cyst', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mercedes Benz sign or Seagull sign The Centre of gallstone may contain radiolucent gas in a triradiate or biradiate fissure This gives rise to characteristic dark shapes on radiograph, the Mercedes Benz sign or Seagull sign Ref: Bailey and love 27th edition Pgno : 1199', 'role': 'assistant'}]